They aren't supertight even on me. Not sure if they are meant to be a bit looser or if they were made with some tree trunk thighed Japanese sprinter in mind.
So, skinnier legs, probably gonna be a bit flappy. The waistband is plenty elastic and has a drawstring though so they'll not fall down.
I’m similar height but more climber than sprinter physique - are the trousers tight and stretchy or will they embassingly fall down