It can be hard to afford two different sets of clothes- work clothes and meeting clothes. Sisters especially, flock to Goodwill like geese around corn. Sadly, most can't afford anything else, so it's not from a choice to shop there. It's from the JW lifestyle keeping them poor, and having to build up a wardrobe of Kingdumb Hall clothes anyway.
It made me mad that I had to wear skirts and dresses to the Hall. What, God doesn't love us in pants? We were born without clothing, so I don't see where he's impressed by what we wear. But yeah, I hear about Goodwill a lot from my mom and her friends. It's heavily frequented by JW's. If you don't care to run into them, it's a good place to stay away from. They do have lots of good t shirts and sweaters tho.