The Teddy Lingerie Sizing Guide: How It Should Actually Fit

We keep a tape measure in the top drawer of the desk for exactly this. Underbust, bust, waist, hip, written on a sticky note, compared against whatever chart the listing bothers to publish. Most people who write to us about a teddy that "runs small" never measured at all, they guessed from a dress size. The dress size lies. Amazon's S/M/L runs at least a half-size tight in the bust on most listings, and the letter sizing hides how much stretch is actually built into the lace. (New to the silhouette? Start with what a teddy is, then come back here.)

Your four numbers

In a well-fitting bra, measure snug but not tight. Underbust: the band, just below the bust. Bust: the fullest point, tape parallel to the floor, no leaning forward. Waist: the narrowest point above the belly button. Hip: the fullest point across the seat. Write them down in inches. That's it. Those four numbers beat every general chart a marketplace posts, and they travel with you across brands, which a dress size never does.

Avidlove and Aranmei, two of the Amazon brands we order most often, use letter sizing that loosely maps to the table above. Loosely. We've had a 34C sit fine in a Medium from one brand and swim in the same letter from another. For 1X and up the trade-offs get sharper, straps, wire, panel placement, and we cover those separately in the plus-size teddy guide or you can shop the best plus-size teddy lingerie edit for brands that actually draft above an XL.

The size chart isn't lying to hurt you. It's lying because it's easier to print one chart than fifty.

The five-minute fit walkthrough

1. Put it on and check the cups first. They should sit flat with no gap at the top and no bulge at the side seam. Puckering lace means too big. Digging means too small.
2. Slide a finger under each strap. It should go in without effort. Any tighter and you'll have a shoulder groove within the hour.
3. Check the back band in a mirror. It should sit level. If it climbs up your back, size down, not up. Sizing up here makes the bust worse, not better.
4. Look at where the waist sits. Not on the ribs, not on the hips. Right in between, where you can still see the shape of your own torso through the lace.
5. Snap the crotch closure. If the whole piece hikes upward when it clicks shut, the torso length is wrong for you. Don't keep it. Return it.

If you're outside the standard torso length

Most teddies are drafted for a 5'5"–5'8" torso, full stop. Under 5'3"? Look for adjustable straps so you can shorten the rise yourself. Above 5'9"? A snap crotch on stretch elastic, rather than fabric tape, buys you close to an extra inch without pulling anything sideways.

When sizing up beats sizing down

Almost always, size up. Amazon lingerie runs small, and European lingerie runs smaller still. The exception is a brand with a documented habit of running large (Cosabella does this, Fleur du Mal occasionally), and even then, only if your measurements land clearly inside the smaller size, not right on the border. Getting married and shopping against a wedding date changes the math again. See the bridal teddy guide for that timeline.