OK, first I agree NO SUITS...none!
Here's how I would dress them
GLENN: Dark wash jeans & a light grey thin cotton pullover with long sleeves, sleeves pushed up a little, 3 buttons, all open. Shirt can have a pale or thin stripe on it, not tucked in...Black boots
JOE: I love the all black look on Joe, This works with his really blonde hair. Black jacket, black tee with a logo or design on it, black jeans...black boots
TIMOTHY: I want Timothy in black or dark wash jeans, a short sleeve shirt, cotton, pull over style in a light blue or aqua, also black boots, & a belt with a turquoise stone & silver belt buckle.
DON; I would like Don also in dark or black jeans, a button down shirt (not plaid) maybe a very thin vertical stripe, blue or grey on a white background, tucked in with a cool belt. Shoes; he can choose what he likes!
YES, That's what I want to see! Casual, comfortable & cool looking, but not too styled.