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.