So my son understands the concept of the whole potty training thing so I pretty much take off his…

So my son understands the concept of the whole potty training thing so I pretty much take off his diaper and he knows to go straight to the potty chair we have here in the living room and his thing is is that he doesn't like to have underwear on because it takes him too long to pull it down and he has to take out 1 of his legs to sit comfortably on the potty chair. I was thinking maybe boxers? That's the only type of underwear I have not tried and also what's the next step to this potty training thing?