Especially for women, I have found great value in the "Dressing Your Truth" information. So much of it is free in youtube videos. Once I understood that I feel better in certain fabrics, colors, silouettes, etc. because of my energy and movement, my personality - then I knew what to look for either at retail or in thrift stores.
For women, thrift stores and ebay are fantastic sources. Women are buying the same items over and over with little satisfaction because they don't understand their own body type, etc. So these women are dumping huge quantities of new stuff into the waste stream.
For men, darn it - not so! Men are more likely to buy and wear out their stuff.
Another tip is about fabric content. I no longer buy anything polyester or acrylic. The stuff looks great in the store and for the first wearing. Then .....it's just cheap. It looks cheap, falls apart, pills, snags, makes you feel all clammy and sweaty like wearing a trash bag, or chills itself to the freezing temps and stays that way, etc. Take the time to read the fabric content label and buy real stuff. You'll be so much happier.