Cycling specific sportswear is lightweight and comfortable so is good for cycling in summer but wear whatever you are happy with. When I started, I wore my running stuff.
Oh, if you didn’t know already, shorts and regular underwear get sweaty pretty quick on a bike. When that happens, you get chaffing, which is painful. That’s why most cyclists wear Lycra bibs (shorts) and no underwear.
It sounds to me that you’ll be doing light touring. I’d just search for that on on google to see the kinds of clothes people wear for touring and go for that look. I’m sure it’s very relaxed/casual.
Nb. This person says they had no problem wearing regular canvas shorts so maybe you don’t even need Lycra.
That I'll have to check into. I know jock itch is no fun during the hot season or any season. But what's the best material then for the summer cut-offs?Yes. Sports wear is functional clothing, built for a purpose. In the beginning you will get away with running shorts and T-shirts. For light touring that’s just fine. But make sure the shorts are breathable (many cheaper shorts aren’t, and I caught an infection once) and do not rub.