Perfect for M size! This is professional-looking and very cool lesson wear. It's recommended to wear a stylish visible bra or bra top underneath! It looks great with both pants and skirts. If you'd like, please take a look at the visible bras I'm also selling (^^) Finally... Although it's new, it's still a used item. I will answer any questions as many times as needed, so please refrain from cancellations or returns after purchase. Also, there may be cases where someone else purchases the item before I can respond to your questions. In that case, I would appreciate your understanding.