I'm sure I'll repeat some of what someone else has said.
Pockets on the tops are for gels. They work great. I can pack 2 gels in each pocket of my tri top.
I put my race belt on in T1. IF it's required. Otherwise, I just put it on in T2. I don't wear it on the swim as I don't care to get my number wet. I do like to keep my numbers to put my race results on the back.
I always wear a visor. I'm a visor girl. I hate hats. A visor is great because I can pull the front of my hair back in a ponytail and it doesn't have to fit through a hole in the back of a hat.
Happy to hear you are getting a tri suit. Changing is really a pain. Way too much time and effort.
"Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather, to skid in broadside thoroughly used-up, totally worn out, and loudly proclaiming: WOW WHAT A RIDE!!!!"