It’s hard to get back on top of your clothes after a break, particularly if your shape has changed. My advice is to make a nice cuppa and spend half an hour on Pinterest, pinning anything you like without over thinking it, and then take a look over it all. This always helps me figure out what I’m going for.
Then go through your wardrobe (and laundry basket) and separate the things that fit, and flatter into what’s seasonal now and what to put away. What’s left will probably have some sentimental pieces, identity clutter etc. Unless you’re in the mood to sort it, just pull out any obvious donations and put the harder decisions to one side for now (but not back in the wardrobe) What you want to concentrate on is your right-now wardrobe.
There are probably things that fit and flatter but you can’t wear because you lack the right shoe, bra, or something to go with it. So at this point go through your wardrobe and make a list, thinking about outfits and what you need to buy to make everything work. And add to that whatever extras you’d like to buy.
It’s so easy to go shopping, and buy lovely things but still have nothing to wear. The list really helps because it keeps you focused on the (often slightly boring) foundational pieces that make a wardrobe great.
If you can afford a colour and style analyst I think it’s money well spent, but otherwise go shopping and try on stuff in as many shops as you can stand. If you have a truthful friend bring her. What you want to find out is which shops’ templates suit your figure best. And which ones don’t. I know that eg. Monsoon doesn’t fit me well so I don’t ever start my shopping there. If I really want something from there I would try it on with a view to the cost and practicality of alterations. And I know there’s absolutely no point in ordering from there online.
Good luck finding a decent t-shirt - I’ve taken some of mine back out of the charity shop bag because they were better quality than I can buy right now. I don’t want to name names but in the last two years, shops and brands I would have trusted have dipped in quality so I would recommend buying nothing you haven’t felt, handled and tried on. If you don’t already know, there are plenty of resources online to learn how to judge quality from the seams, stitching, etc. One of the questions I ask is could I get this repaired - that gives me a reference point for what I’m willing to pay.
Hope there’s something helpful in all that