We had no pants for some time with my daughter. We then moved onto just trousers when out, as she found it really tricky to do pants as well. She's beginning to get the hang of both now. We started training in September.
My daughter loves having no pants on at home. She spends I’d say 90% of her time naked! She loves running round with no clothes on. She also tries to pull her pants off sometimes inside but she never does it when we’re outside the house. Have you actually been out yet with pants on or do you assume he’ll just do a wee so put a nappy on? I put my daughter in pants, her trousers, and then a pull up on top for the car. If she does a wee I just have to change her trousers and pants but I also take a potty in the car so whenever we get to where we’re going I put her on it and before we leave too. We’ve been potty training since 18 months and she’s 2 next month
Commando and baggy trousers! Definitely don't put pants on until he's well established with pottying. Just try baggy trousers for a while and then add pants later. Also, my 3 year old has been trained for 18 months and is only now pulling his pants and trousers down himself for the toilet! So that might not come for a little while, it's more an age/developmental thing to be able to undress. But keep encouraging it.