When you buy new clothes do you wash them first before wearing them or do you just wear them first time without washing them?

I always wash them first. Never know where they've been or who handled them before you bought them. Plus, it's just a good idea as you never know what chemicals could still be in the new cloth. Best to wash first!

Yes, you should always wash new clothes before you put them on. Depending on the person, new clothing sometimes has contents on them that cause rashes and irritation of the skin, so washing them washes those things away that way you won't have discomfort.