Sprints - Tight clothing?

CHEETAH

New member
Well, my coach told me for sprints tight clothing makes a big difference but for long distance you need loose clothing because it's more comfortable. I was wondering if tight clothing did make you faster in sprints for example if I had a 12.1 second 100meter dash with really loose shorts and t-shirt, would it go down to a 12 flat or possibly 11.9 with tight clothing?
 
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