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In a 30E, the 30 refers to your ribcage measurement and the E to a bust roughly 6 inches larger than it. If you've been fitted in a US brand and are shopping a European label, expect the letter to shift — the volume stays the same, the notation doesn't.
How a 30E should fit
Support at 30E comes from structure rather than tightness. Look for a band with three or four hooks, wider side wings to stop the cup pulling forward, and cups seamed in sections rather than moulded from a single piece.
Sister sizes to try if 30E isn't right
- Band feels loose but the cup is right — try 28F
- Band is comfortable but you're spilling over — go up to 30F
- Band digs in — 32DD gives the same cup volume with more room
Best 30E styles
Full-coverage and balconette shapes are the most reliable at 30E. If you want something under a t-shirt, choose a moulded cup with a seam beneath the bust rather than a completely smooth one. For sport, an encapsulation bra that supports each breast separately will beat a compression style at this size.
