Levi - only for one specific style of jeans
(all my jeans are the same Levis but in different colours/ shades, all from Vinted. I have six pairs I think. They work for my body shape and I love the pockets. I wear them for work- most colleagues wear jeans 95% of the time for practical reasons, and on about 50% of my days off. It it took me until my 40s to find my perfect jeans).
Hush or Wrap London for jumpers - not sure which. My Wrap ones are also from Vinted, Hush direct. Again they do styles that work for my body shape and lifestyle and neckline and length options I like and wash reasonably well at 40° even when labelled 30° ...
Uniqlo for knickers, socks, heattec layers, leggings some trousers, maybe their merino wool stuff. Mostly winter stuff, don't really buy summer stuff there.
I'd have to cheat for bras though as there's only one bra that works for me which is from the brand Freya. Harsh to have to nominate that as one of my 3 but if I had to I'd gwt rid of Uniqlo and keep Freya as they sell knickers, I just don't buy them there as it's not worth the price. I buy my bra sized swimwear there too though. A perfect bra is such a holy grail, like perfect jeans.
I'd also like to have a walking/ hiking brand - Fjall- Raven (Vinted again) or Meru ...