If you know your size from r/ABraThatFits, order that, but the letters are all weird because these don’t double to you have to count up the same number of inches. my 34” band size cup would be DDD (I normally wear 32G), so I got 34F here. This bra is a very good value. It doesn’t have the manufacturing precision of a higher-end bra, but the style is as pictured and it looks nice. I would consider it “special occasion” lingerie since it doesn’t look great under clothing. The straps can be crossed or swapped out for other straps because they have hooks in the back and the front. I got a 20% off deal and this is easily one of the best ~$16 bra purchases I’ve made. I wear 32 on the largest hook normally (my snug underbust measurement is almost exactly 32”) but I wore this on the smallest set of hooks, so 34 tag size is correct. It was surprisingly not itchy at all despite being mostly lace. Great purchase!I wish it had more support. Straps are small ,thin. Fit to US size. Looks nice. Not for a heavy breasted woman.Looks great under a sheer shirt, the band size is right on but the cup size runs a little small. But I love this bra!