Wearing sports clothes in public?? Ok or not?

Am just wondering what people think.. Apart from ralaxing at home, sports/gym/walking/running etc etc is it ever Ok to wear gym or sports clothes in public,even if the person has not been doing sprts at the time.. Say sweat/tracksuit pants or sweat top, tracksuit top/fleecy type top, or leggings..with sneakers. why or why not? plse explain yr answer.

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