My local tri club has a team kit this year and I am right in between sizes. When I tried it on the guy at the shop said either the L or XL would work and it was personal preference. Would you all like one that was a tiny loose or tiny bit tight and why?
Tighter will be more aero.
Depends:
If you are going to swim with it under a wetsuit, you can go with a looser fit. If not def. go with the tighter fit.
If you can unzip it on the run so it’s not too constricting, go with a tighter fit.
If it’s nylon, it’s going to expand a bit when wet, so go with the tighter fit.