Bra Anatomy: Every Part Named and Explained

The map, region by region

Seam anatomy: reading a cup like a fitter

Seams are load paths. A vertical seam up the cup lifts: it shortens the cup’s profile and points tissue upward. A horizontal seam rounds: it controls projection depth. A diagonal seam does both at an angle, and the classic three-part cup, two lower panels plus an upper, is the full toolkit: lower seams set lift and projection, the upper panel’s edge sets coverage and flexibility, which is why the construction guide and half the fix cluster keep prescribing it. A cup with no seams at all, molded or contour, replaced the load paths with a fixed dome: smoothest surface, least adjustability, the trade that page maps in full.

Where quality hides

Price and quality correlate loosely, but construction tells the truth up close. Look for: hook-and-eye tape with three or more columns sewn through, not glued; wire channels with dense, even stitching and capped ends; elastic edges attached with multi-needle coverstitching that stays flat; sliders and rings in metal under any coating; and pattern-matched lace at the gore, which signals a maker who cared about harder things too. None of these appear in product photos, which is why the checkout page cannot tell you what the inside of the underarm seam can.

Why the vocabulary matters

Every fit symptom maps to a component, which is the entire method of this site: a band that rides is a band-and-wing problem, spillage at the side is a sling and wire-height question, a floating gore is a gore-versus-anatomy negotiation, straps that dig are a band failure wearing a strap costume. Name the part and the fix cluster becomes an index instead of a mystery: twenty symptoms, each one a component behaving out of role. This page is the legend for that map.