Why Ready-Made Curtains Never Hang Right (and How Custom Sizing Fixes It)

By Tina Bennett, Designer at UniCurt · Last updated July 2026 · ~7-min read

Here's exactly what goes wrong with each one — and the numbers that make a curtain look tailored instead of temporary.

Those fixed sizes exist for a reason that has nothing to do with your home: U.S. standard curtain lengths — 63, 84, 96, 108, and 120 inches — grew out of the 8-foot ceilings in most mid-century houses, not your particular window. So the size almost always lands a little off, and it shows. By some industry sizing guides, poor sizing is behind as much as a quarter of all window-treatment returns. The fix isn't guesswork — it's four numbers you can control.

1. Length: the dead giveaway

Ready-made curtains come in a few standard drops — usually 63", 84", 96", 108", and 120" (160, 213, 244, 274, 305 cm). Your actual top-of-rod-to-floor measurement almost never lands on one of those. So you get stuck: buy the shorter size and the panel hovers awkwardly above the floor (the "flood pants" look), or buy the longer size and it heaps up in a way you didn't choose.

The rule designers use — the hem should reach the floor. There are three clean finishes:

• Float (or "kiss"): the hem sits about ½ inch (1 cm) above the floor, or just grazing it. Crisp, tailored, easy to vacuum under. Best for busy rooms, radiators, and pets.
• Break: the panel is 1–2 inches (2.5–5 cm) longer, so the fabric gently bends where it meets the floor. Softer and more relaxed.
• Puddle: 6–16 inches (15–40 cm) of extra fabric pools on the floor. Romantic and formal — but high-maintenance and a dust magnet.

How custom fixes it: you give the exact rod-to-floor number and pick the finish, and the panel is cut to it — to the centimeter. There's no rounding to the nearest package — our free measurement tool gets you the exact number in minutes.

2. Width: it doesn't actually cover the window

A ready-made panel comes in one standard width (often around 50" / 127 cm each). The problem is that curtains need to be wider than the window — both to cover the glass when closed and to sit off the glass when open. Stretch one skimpy panel across a wide window and it reads like a flat bedsheet tacked to the wall.

The rule — plan to the rod, not the window. Extend your rod 8–12 inches (20–30 cm) beyond each side of the window frame so open panels "stack back" onto the wall instead of blocking the light. Your total panel width has to be enough to fill that rod and stack off the glass.

How custom fixes it: the width is built to your rod length and how you want the panels to stack — so they close fully and open clear of the window.

3. Fullness: the flat, skimpy look

This is the single biggest thing separating "looks cheap" from "looks custom," and almost nobody outside the trade talks about it. Fullness is how much more fabric than the rod width goes into the panels. Ready-made panels are often close to flat — roughly 1x to 1.5x the width — so once they're hung they look thin, stretched, and a little sad.

The rule — 2 to 2.5 times the rod width. For a proper gathered or pleated look, your panels should total 2x the rod width for a tailored finish, and 2.5x for a lush one (sheers can go to 3x). Fullness varies by heading — Homes & Gardens, for example, lists about 1.5× for pleated headings (the pleats are built in) and 2× for grommet and rod-pocket styles. Example: an 80-inch rod wants roughly 160–200 inches of total panel width. That's what creates those deep, even folds that read as "designer."

How custom fixes it: fullness is built in from the start. You're choosing the look, not inheriting whatever fold happened to come folded in the bag.

4. The floor finish and hanging height

Even if a ready-made length is close, you still can't dial in how it lands. And there's a second half to this that fixed sizes quietly sabotage: hanging height.

Hang high and wide. Mount the rod 4–6 inches (10–15 cm) above the window frame — or higher, up toward the ceiling — to make the window (and the whole room) look taller. But here's the catch: hanging high only works if the panel is still long enough to reach the floor from up there. Off-the-shelf drops usually aren't — so people are forced to mount the rod low just to make a short panel touch down, which flattens the whole room.

How custom fixes it: you choose the rod height and the floor finish, and the length is made to match both. High rod, floor-length panel, clean break — all at once.

Ready-made vs. custom, on the four things that matter

How custom sizing actually works (and why it's not the hassle you think)

The reason people default to ready-made is they assume custom means a tape measure, a phone call, and a lot of room for error. It doesn't have to. Our free online measurement tool walks you through it and calculates your ideal size in a couple of minutes, and our free online custom service lets you set the rest — all on our website, before anything is cut. In about five minutes you can choose:

• Your heading style — pinch pleat, S-fold (wave), grommet, back tab, rod pocket, and more.
• Exact made-to-measure size — width and length built to your window, in your chosen floor finish.
• Permanent shaping — sets crisp, even pleats or S-wave folds that hold their shape, so panels hang perfectly and need no ironing.
• Lining — add a blackout or drapery lining for full light control and a heavier, more luxurious drape.
• Matching cushion covers & tiebacks — pull the same pattern onto coordinating pillow covers and tiebacks for a pulled-together room.

Not sure how it'll look? See it first with our free online room-preview renderings, or book a free online design consultation and we'll size and style it with you. 

Because we're an independent brand that develops its own textiles and sells direct, a made-to-measure panel comes in at roughly one-third the price of designer fabric houses — so getting the fit right isn't a luxury add-on. And since we design our own patterns, custom also means you get the print you want at the size you need, instead of settling for whatever the shelf happens to stock.

Every fabric is Oeko-Tex certified, swatches are high-quality, true-to-life samples (the same fabric you'll receive), and every order is backed by our 60-day satisfaction guarantee. 

Frequently asked questions

How long should curtains be? For a polished look, the hem should reach the floor. Choose a float (½ inch / 1 cm above the floor), a break (1–2 inches / 2.5–5 cm longer so it bends at the floor), or a puddle (6–16 inches / 15–40 cm pooling). Sill-length panels almost always look unfinished in a living space.

Should curtains touch the floor? Yes, in most rooms. A float that just kisses the floor is the most versatile and easiest to maintain; a break is softer; a puddle is formal. Panels that stop above the floor read as too short.

How wide should my curtains be? Wide enough to fill a rod that extends 8–12 inches (20–30 cm) past each side of the window, with enough fullness that the total panel width is 2–2.5 times the rod width. That's what lets them close fully and stack off the glass when open. One ordering tip for UniCurt: our pinch pleat and S-fold (wave) headings already build in 2–2.5× fullness, so you just order at 1× your rod width. Headings you gather yourself — grommet, back tab, and rod pocket — should be ordered at about 2× the rod width for a full look.

Why do my curtains look skimpy? Almost always, not enough fullness. Flat, 1–1.5x panels look stretched. Aim for 2–2.5x the rod width in total panel width for full, even folds.

Are custom curtains worth it just for the fit? If your windows aren't a standard size — and most aren't — yes. Fit is the difference between curtains that look intentional and curtains that look like they came out of a bag. Custom sizing gets length, width, fullness, and floor finish right in one go.

Why we do this at UniCurt

We started with Custom Curtains and Roman Shades because fit is where most window treatments fall apart — and it's the easiest thing to get right when a panel is made for your window instead of a size chart. That same made-to-measure approach is now rolling out across our soft furnishings, so a whole room can be built to fit, not forced to.

Rugs, cushions, tablecloths and more are arriving soon — stay tuned.