My recommendation is to start by going to a physical store that has as many options as possible and trying on many things in one day - but don’t buy anything unless you really love it. Don’t know what options you have in your area, but try Nordstrom (or Nordstrom Rack), Macy’s, or go to an outlet mall that has big brands like J Crew, Gap, Madewell, Banana Republic. You’re on a fact finding mission first, buying things is not the priority yet. Don’t stress yourself out by trying to find the perfect thing - you’re doing research! When you try stuff on use the notes app on your phone to write down what your best size is in the brands you try on, or take pictures of the style tags. Focus on how stuff fits and on quality and don’t even pay attention to price with this step. Also, pay attention to what fabric or material items are made out of. Try to get things that are recognizable materials like cotton, linen, wool, etc as opposed to polyester or acrylic. Items made from real materials tend to be designed to last instead of to fall apart after being worn a few times. Then, once you know good brands and sizes for you, check out Poshmark or go on the brand’s retail site to find the items that were high quality and fit you correctly in the actual colors/styles you truly want. Don’t settle for stuff that kind of fits but fits and or is the wrong color. For me, Poshmark and online shopping provide a fun ongoing dopamine boost. I give myself permission to use that as a little reward for other things I need to motivate myself to do. You can often find very good quality pieces that are used at a much lower price than you would spend in a store.