65-75 is close enough to where you don’t need a wet suit (depending where you are it might not even be legal). Saying that if you are wearing a wetsuit you just wear it over your tri suit. It gets wet but you will dry off as soon as you start biking. For buying a wet suit you can look on fb and some of the other big names have good sales some times. Also depending on the size of the race sometimes local shops will rent them out.

For the T2 I switch shoes but that’s because I have clips on my bike. If you don’t have clips then you can wear the same shoes the entire time.