My son is 3.5
only recently he has been, on his own, "ready" to potty train.
He goes on the potty chair. Not yet a toilet.
We had him initially naked. Then now he wears underwear, the Gerber Training Pants or the Potty Scotty underwear, both of which is padded in the middle.
My son does know when/if he has to go potty. But he can't hold it for very long. We keep the potty chair near him wherever he is. He goes on it himself. He does still need help with pulling down and pulling up his underwear. Which is normal.
Yes, its a learning curve. Each child is different. Some just don't know their cues yet, nor have it defined nor perfect. Give him time. But yes, you need to occasionally 'remind' them. They are still young to be totally self-sufficient at it.
Don't use pull-ups, they are useless and expensive.
My son is not yet ready, to be in just underwear when we are out.. he can't hold it that long. So when out he is in a diaper. He knows its just for going out. Also for his naps and bedtime, he is in a diaper. He is not dry yet for naps or bedtime. Which is normal.
Keep in mind, that for night time, "night dryness" is something that is not attained until even 7 years old. Night time "dryness" is a WHOLE other thing, SEPARATE from day-time toileting. Because it is BIOLOGICAL based and their bladder/nerve/brain connections. Even my 7 year old, still once in a blue moon, will have a pee accident at night. Its no biggie. Normal per Pediatricians and my daughter's Teachers.
10 days of trying is not much. Maybe for you its a long time, but not for a kid. Your boy still pees in his underwear... he is not yet "mastered" at it or controlling his bladder, nor differentiation of it per naked or having something on him. Learning curve.
And yes, even OLDER kids sometimes 'forget' to go pee, because they are playing. MANY kids do that. They "think" they can hold it. Their mind and body assumptions are not on target yet.
He will accomplish it. Don't worry. But he will do it on his timeline, not yours. And just calmly 'remind' him to pee...
I would, keep him naked... since he can do that well. Then now with his underwear on, just realize that it will take him time to get used to that.... it is 2 different things.
Just make sure you encourage him to trying "his best"... not it being "perfect." Otherwise, there is no good feelings about it, for the child. If he makes an accident, then no biggie. Just know that he is trying his best... he is still learning. Praise him.
I don't give 'rewards/treats' for potty perfection. Otherwise a kid just expects a treat everytime. I just praise my boy. He gets proud and gives me a high-five.
Don't worry.... he will get it. Boys are often later with pottying.
all the best,
Susan