MOGUMens Slim Fit Suit 2 Piece Tuxedo for Prom Business Wedding Dance (Suit Jacket + Pants)

Is it asking me the size for the jacket or the pants? Also what size should I get if I have broad shoulders, long arms and weigh 125, height 6’3

Can I put a real handkerchief in the chest pocket or is that little white piece of the pocket square sewn into the pocket so you can't add your own?

Is this for men or child? I need a 34" length but don't see it as an option. My son is 6'0"

I am man size 34 on jacket 31 on pantwhat size should i order