Golf is a simple sport just like baseball, skateboarding or whatever sport. You are not a better human for playing golf. It´s not a wedding or a funeral or a business lunch where you are trying to sell something or show your respect for the occasion 😛
flip flops I have yet to see on the golf course wouldn´t be very comfortable I imagine. shorts I see every day why is one shorts okay but another not?
Welcome back to golf and to TST! When I first joined TST, I could barely make it off the tee box either, but I didn't have an injury, I was just bad! I think you'll find we can help you quite a bit here.
Do you wear board shorts and a tank top and flip-flops to a church wedding? To a business lunch? To a funeral?
I don't really care much about dress codes… but I've never cared "against" them either. Just wear something decent.