When I first starting teaching school, I needed dressier clothing than what I owned. I went to the Goodwill store and found a couple of very nice suits (I did have them altered a bit) for about $30 for both of them. I also got a couple pairs of slacks and a couple of sport coats. All of this for about $50.
While I now have a closet containing suits that each cost between $500 and $1200, I will never knock anyone who buys their clothes at Goodwill. What I bought there got me started when I needed it and didn't have the money to spend. I always donate my old clothing, suits, etc... to them so that maybe they will help out somebody who needs it.