Is it weird to wear the same shirt twice a week?
Is it weird to wear the same shirt twice a week? Answer: No, it is not unprofessional to wear the same clothing item twice, thrice, or as many times as you want to wear it during a work week. My guess is you're asking because you're afraid of what people will think of you if they noticed. If so, don't.
Is it weird to wear the same clothes for 2 days?
From the point of view of hygiene, it's ok to wear the same pair of trousers/pants for a week, and ok to wear the same jumper, providing they're not dirty or stained. Shirt, Tee shirt, socks, underwear should all be changed every day, (and washed in between wearing).