Ainiel Men’s Arabian Prince Costume Aladdin Street Rat Suits

Can the vest come off separately?

I am trying to decide between a small or a medium size. This is for my son. He is 14 years old. 5'7" tall, 138 pounds. Appreciate any feedback!

My boyfriend is 5'9 1/2 and his waist is 32 inches. What size should he get?

Can the vest detach from the shirt?