What should my toddler sleep in?

What does your hot natured toddler still in diapers sleep in? My son is almost 17 months we were using little sleepies but he got so hot and im trying to think what could be comfortable and cool for him to sleep in?

Buy regular pajamas for him. There’s lightweight pajamas with the fabric being thin which would be cool for him to sleep in

Just their diaper. If clothes make them hot then don’t have them wear any.

Let him sleep in just his diaper if he’s hot all the time.

Mine just sleeps in just his diaper. Anything else he gets just way to hot and gets up in the middle of the night