The girls use the crew rest areas to change. On the 747 one is on the upper deck. The door is next to the stairs. In the very back of the main deck there is door across from the lavs. Behind is a fly of stairs down. I have no idea about the other planes.

And the boys and their roomy jackets… When you go in a regular shop like Carrefour or BigC you hardly find a shirt size S. The latest fashion is wearing very tight pants and they are supposed to end 2-3 cm above the floor. But what you see is they are far longer because the guys are so small. Even when they sit the seam touches the floor. I am watching this pretty closely because I am 1.90 cm tall, but sometimes I find pants from the shell that fit.

I think this is a physiological thing. It is hard to sell a Thai "man" clothes size S. It took me months to convince a Thai friend that he is not size M but S. Wearing M made him even look more petite.