I spend most on my bags (because I love bags, they really can elevate an outfit), shoes/boots (ditto, but also the quality of your footwear makes such a difference to your overall look) and coats/jackets (ditto, ditto). I very rarely buy any of these things at full price.
I have a handful of very expensive bags from Mulberry, Anya Hindmarch, Aspinal, Marc Jacobs and Michael Kors (not recognisably his, though!), a few from Mid range fashion brands like All Saints, Kate Spade and Mint Velvet, plus quite a few cheaper ones. I’ve just bought a lovely bag from Toast in their sale which is going to be my go-to for day-to-day casual wear - beautiful leather, small, boxy but relaxed style, crossbody so easy to use. I’m very annoyed that it’s now reduced even further to £85 which is quite a lot less than I paid for it two weeks ago! It will fill a hole in my evolving capsule wardrobe and will probably last at least ten years and still look really great, hopefully more like twenty! I’m really starting to buy now with longevity in mind, and pieces that won’t date. I also will no longer buy anything that is similar to something I’ve already got.
I buy shoes from lots of different places, always heavily discounted in the sales. Hobbs, Jigsaw, Kurt Geiger, Dune, ASH, Timberland, M&S, Clark’s, and also Sports brands such as Adidas, Nike, New Balance.
Coats/jackets, again, I always buy these in the sale. Hobbs, Jaeger, Jigsaw for formal or smarter wool coats. Barbour, Joules, banana republic for casual/outdoorsy and wool/tweed blazers. Mint Velvet, Jaeger, Muubaa and Mango for leather/suede jackets. Hobbs and Jaeger for summer blazers. This year I’m looking to get a light casual jacket in Khaki from Hush or Topshop, because that’s a definite hole in my wardrobe for summer. Hopefully I will find one on eBay, otherwise I will wait for the sales. Denim jackets I tend to buy cheap but fairly good quality - Sainsbury’s, New Look or Mantaray or wherever I see one that fits the bill.
Clothing is a mixed bag - I’ve got a few more expensive things, again Hobbs, Jigsaw, Jaeger, Barbour, Joules, banana republic, but most of my current clothes are from M&S (because there’s a big store almost right next to where I live so I tend to pop in, and I like being able to actually try on before I buy. Plus if you pick well I think you can get pretty good quality for what you pay - again, I almost always buy in the sale. I often only pay something like £11-15 for a very nice shirt or top reduced from something like £30-40. Leather/suede shoes for around £20 reduced from anywhere up to about £50. Haven’t tried any of their cashmere yet. I really rate their jeans and Jeggings).
Where else? Mango, H&M (although it’s a pain with the ridiculous inconsistencies in sizings so I don’t go very often anymore), Tesco F&F, Sainsbury’s Tu, New Look, River Island, Topshop. I think it’s much more about the specific piece and its quality rather than brand, especially if you are working to a budget.
I’ve only bought cashmere this season for the first time, one full cashmere jumper from Joules. I’m not sure how good it will actually be but I loved it, it filled a hole and I got it at a good price. One wool/cashmere/cotton mix jumper from Barbour, one merino wool jumper from Jaeger. I’ll see how I get on with them in the next year or so. If I decide I would like more I will probably switch to eBay buys and TK Maxx or research a bit more to find the really good value brands.