@Bhutan - I think that consignment shops are great places that sell used clothing. I lot of these stores specialize in children’s clothing which is great because kids outgrow outfits so fast that it can be really expensive if you always buy new clothing.
It is also a good business to start because it is easy to get used clothing. Some people set up consignment shops online and sell their clothing on auction sites while others have a more prominent storefront location in key parts of town.
I had a friend of mine that looked into to buying bulk used clothing from liquidators which included clothing that was returned to the stores but otherwise was in good condition.
With this type of order you really have to have a good amount of capital because a bundle of clothing can cost thousands of dollars so if you are starting out, this might not be as cost effective.