Finally I bought it in size M, and indeed it seems that this is a cup for men, but other than that, really good size, it is barely longer than a shirt made for woman, M size should suit the person receiving the gift, which measures about 1m67. Personally I measure 1m73 and I'm a size 38/40 top, so I took another shirt of the same brand in size L, and I think it will go very well, a little loose but I like to be comfortable.
Regarding the picture on the t-shirt I think the cat has the eyes of a little more dark blue; it's nitpicking. However, very good surprise on the whole shirt, because the background which in my memory was black crude is actually slightly nuanced (it shows in the picture but I confess not to have been very careful, certainly hypnotized through the eyes of the cat all round ...).
Delivery received on time, in satisfactory package.