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Downhill MTB banned or made a rule to prevent skinsuits. waves at Sam Hill
https://www.youtube.com/watch?v=wVwvXKhQvkE
But if you watched the Worlds this year
https://www.youtube.com/watch?v=MCWG1-PZgHo
you'd see almost all of them are running super tight trousers and tops - almost looking like they're skinsuits - definitely shaped and tight compared to the old "cool" flappy stuff that UCI wanted over skinnies.
Replying to a 2 month old comment about aero clothing in running:
I think there’s some regulation about track events and clothing, a bit like swimming.
The longer distance stuff uses pacemakers and groups (think the sub 2 effort) to achieve what it can. 100 -800 m I don’t know how much a skin suit would save you / is it allowed.