Appropriate corsage for 8th grader?

[alum]

My clueless son is taking a girl to the 8th grade dance. She must be somewhat desperate (although her yearbook pic is cute) since he asked her today and the dance is Friday. He was just going to go with a bunch of friends (a much more age-appropriate method IMO) but then found out that people are pairing off. Nothing like waiting until the last minute....

So anyway, given that the girl is still a 14 y.o. GIRL and not an adult-sized 18 y.o., what size corsage would not look too overwhelming on her wrist? I figure the wrist is safer than him trying to pin a corsage to her chest. I did make him call her and found out the dress is black so what would be appropriate flowers in terms of coordinating color and species?

I really wish the school coordinated this dance as they did 6 years ago: directly after school and there were no "dates" allowed. I think I am going to have much rougher teenage years ahead with this kid vs my oldest.