Joins & Pattern Matching in Custom Window Treatments

When it comes to covering extra-wide windows, custom curtains and roman shades more than meet the challenge of finding a perfect-size match. But, with these generously-sized, extra-wide window dressings comes a small—often overlooked—detail.

Most drapery fabric bolts are 54 inches wide, which means anything wider—like curtain panels for a grand French door or roman shades for an expansive window bank—will likely need more than one ‘bolt-width’ of the fabric. And where those bolts meet, you can expect a seam. But should it bother you? Not quite. So, do curtains and roman shades have seams? Only when they are wider than the fabric bolt: at Sewn, any curtain panel or roman shade wider than about 48 inches (or about 20 inches for pinch pleat curtains, which take far more fabric) is joined with vertical seams, never horizontal ones, and we match the pattern across every join. Pick the right pattern, color and fabric (and, for curtains, the right fullness), and those joins all but disappear. Read on as our stylists explain why curtain seams and roman shade joins are rarely worth a second thought.

‘Seams’ Like a Dream: How Joins Hide in Plain Sight

If you’re considering ordering extra-long curtains or shades, be assured that panels of any length (vertical drop), up to 252 inches, can be sewn without needing horizontal joins to run through them. This is because the length comes ‘off the fabric roll’, allowing long, uninterrupted drops. 

The width, however, comes from the width of the bolt. Therefore, when the width of the curtain or shade needs to go wider than the width of the bolt, joining seams become unavoidable. But here’s the good part of the story—in most cases, these seams are too subtle to invite attention if handled with thoughtful and flawless craftsmanship. Furthermore, many fabrics—thanks to their pattern, color, or weave—disguise their joins and seams surprisingly well. Let us walk you through how: 

• Perfectly matched patterns, leaving no sign of discontinuity or misalignment, perform the best vanishing act on fabric joins. The busier the pattern, the finer the guise. Furthermore, at Sewn, we carefully join panels with the pattern flowing seamlessly across any seams, leaving no abrupt cuts, missing parts, or awkward intersections. Therefore, on a patterned curtain or roman shade, joins only show on closer inspection or when strong sunlight shines behind. Roman shades of the same size in one order are pattern-matched to each other too, and shades of different sizes are matched at the top.

• Pleats of a curtain offer a safe hiding place, so drapes have it relatively easy. As long as your drapery is measured and specified to feature a rich gather of pleats, seams stand a good chance of staying hidden between the pleats. For obvious reasons, a lush curtain with deep, dense pleats will prove better at concealing the joins than a curtain with shallow and sparse pleats. Our pinch pleat curtains have 2.5–3x fullness sewn in, far more generous than many suppliers, while for grommet, rod pocket, back tab, flat panel and pencil pleat curtains we recommend 2x fullness (1.5x at the least), and 1.5x for tab tops and tie tops (sheers up to 2x). For detailed, step-by-step instructions with handy illustrations, see our Drapery Measurement Guide.

• Colors can camouflage the joins and seams, depending on their intensity and hue. Dark-toned curtains and shades are better secret-keepers, while those with light and bright hues show their seams relatively easily. So, expect the seams to be more noticeable if your palette is soft and pale.

• Fabric opacity plays a role in how much the seams are exposed. Thick, opaque fabrics like tight-woven cotton or velvet will perform better at minimizing the show of seams than a sheer, semi-sheer, or loose-woven linen.

• Distance obscures the visibility of joins, even when all the above factors may not be in favor. Unlike rugs and upholstery, where the fabric joins become tactile and loud (a felt experience), the joins on window dressings typically go unnoticed because curtains and shades are mounted at a distance, and rarely touched, except for opening or closing.

In summary, be assured that fabric joins in extra-wide curtains and roman shades are not quite the aesthetic deal-breakers you might have imagined. When deciding the width of your curtains and roman shades, let the window’s width, desired coverage and your aesthetic vision guide you—not the presence of a seam. But, just in case you still have a good reason to be bothered about the joins, know that ordering multiple, narrow panels is always an option you can explore.

HAUL 'EM HOME: Velvet Curtains | Patterned Curtains | Cotton Roman Shades

A Seamless Strategy: How We Place Joins At Sewn

Given that most drapery fabrics tend to be 54 inches wide, curtains and shades wider than 48 inches require additional fabric bolts to be joined to achieve the specified width—and hence, seams become inevitable. For pinch pleat curtains, which have 2.5–3x fullness sewn in, each width of fabric pleats down to only about 20 inches, so their seams fall roughly every 20 inches of finished width. We make curtain panels up to 288 inches wide and roman shades from 18 to 96 inches wide. While the exact placement of seams is solely at our expert tailors’ discretion—and varies based on each article’s custom specification—we do follow some general principles. 

For orders that include one single curtain panel, the join is placed exactly in the center to maintain symmetry. Orders with two (or such even count) panels are assumed to be for pairs intended for mounting together on the same window. For such pairs, we avoid joins at the center and instead, place them on the sides of the panels. This keeps the middle of each panel visually seamless, while allowing the joins to hide in the side stacks.

For roman shades wider than 48 inches, we tend to keep the middle portion of the shade join-free, and place seams on both ends, cuing in the quiet beauty of balance. For instance, a 96-inch wide shade will often be stitched leaving the middle portion of 50-inches seam-free, while the remaining fabric (46 inches) is distributed evenly on each side, entailing a seam on either edge. 

HOMESEWN HANDBOOK: Drapery Measurement Guide | Roman Shades Measurement Guide

Curtain Seams & Pattern Matching: FAQs

Do curtains have seams?

Only when they are wider than the fabric bolt. Most drapery fabrics come on 54-inch bolts, so curtains and roman shades wider than about 48 inches are joined with vertical seams. Pinch pleat curtains use 2.5–3x the fabric, so their seams fall roughly every 20 inches of finished width. Narrower panels are cut from a single width and have no joins at all.

How wide can a curtain be before it needs a seam?

About 48 inches for most headings, and about 20 inches for pinch pleat curtains, since each width of fabric pleats down to about 20 inches. Beyond that, another width of fabric is joined on, and we make panels up to 288 inches wide in this way, with the pattern matched across every seam.

Where are the seams placed on a pair of curtains?

Toward the sides of each panel, not in the middle, so the center of each panel stays seam-free and the joins tuck away into the side stacks. A single panel ordered on its own has its seam in the exact center, for symmetry.

Where are the seams on a wide roman shade?

On a shade wider than about 48 inches, we keep the middle seam-free and place the joins toward both ends, so the shade looks balanced. A 96-inch shade, for example, often has a seam-free center of about 50 inches.

Are patterns matched across curtain seams?

Yes. We join panels so the pattern flows across every seam, with no abrupt cuts or missing motifs. Roman shades of the same size in one order are matched to each other too, and shades of different sizes are matched at the top.

Do long curtains have horizontal seams?

No. The length comes off the fabric roll, so even our longest panels, up to 252 inches, fall in one uninterrupted drop with no horizontal joins.

How can you make curtain seams less visible?

Choose a busy pattern, a deeper color or a denser, more opaque fabric, and give the curtains plenty of fullness so the joins hide between the pleats. If a seam would still bother you, order several narrower panels instead of one very wide one.

The Last Word on Joins & Seams

Joins in extra-wide curtains and custom roman shades are not defects or flaws—if anything, they are subtle giveaways of their bespoke making! So, go ahead, and dream wide—don’t let joins and seams limit your imagination or your window’s potential. Whether you choose a painterly floral or a plain neutral from our more than 2,500 fabrics, we will keep the pattern ‘seamless’ and the finish at its finest. Joins play a part—but rarely define the story your windows tell! If you’d like a hand planning a wide window, our designers are just an email away at hi@sewndrapesandshades.com.

HOMESEWN WISDOM: What Is the Best Fabric for Curtains? | Best Fabric for Roman Shades