This is a tip handed down to me by my grandma and my Mom. I grew up in a small town and my Mom was a snob. Hmm… I don’t think she’d like me saying that 😉 But growing up, she shopped for our clothes in other places, never in town so we’d only shop once or twice a year, around Chinese New Year (and thanks to Mom, we stood out in our out of town finery! 😉 )
When she got home, she’d empty all the year’s worth of clothes for the whole family into a HUGE tub and handwash every single item before we could wear them. She said it was more hygienic and that the clothes won’t be as hot when we wear them.
When I grew up, I did the same because I always listen to my Mom and because I found from experience that washing new clothes before wearing them made them more comfortable. Truly, they did not feel as hot when you wear them for the first time.