I wear S and have this corsage ordered in S and it fits perfectly. They also like it very much. The back strap and the front belts are satin ribbons and refine the corsage. The back lacing is not directly on the skin but it is sewn on a piece of fabric as with most corsages. So the bands lace not directly on the skin and from behind one also sees no skin. The tapes have already moved and a little instruction on how it attracts and constricted is both so everything easily. The fabric feels comfortable on the skin, not scratch or pricks. The string I have not tried it yet because it is not important for me, and just a nice little side dish.
From my side a strong buy recommendation. Very lovely corsage for little money and no size conversion necessary. For this purpose the fast delivery comes (within 3 days).