How can i make my hair curly through braid?

ok so i want my hair to have a gorgeous curl through braids when i braid it and sleep with it and then tomorrow if i remove it. it will be gorgeous how do i do it? and it will just be curly it will not turn to straight again you know what i mean.. cuz some girls at school i saw their hair it's like a wet look and they just braid it i want my hair like that but i don't know how.?