I would say, for myself, it is definitely a mixture of high-mid-low pieces. It is really down to the individual item and whether it goes with my planned outfit.
I tend to splurge the most on bags and shoes, followed by outerwear, but nothing in the realm of Hermes prices.
My outerwear pieces are usually from Burberry, Moncler, Canada Goose and Theory, but I also like buying pieces from brands like Tommy Hilfiger, AllSaints, Ralph Lauren, Lululemon etc. As long as the item looks well-made when I'm buying it, I'm not particularly fussed about its provenance.
I like buying designer tops (jumpers, sweatshirts and the like), but I probably rarely spend much on trousers (my thunder thighs mean the inevitable wear is sped up exponentially, and I've learnt the hard way that expensive or cheap denim behaves the same way for me). Usually ASOS is my go-to for those, and they have served me very well! I tend to just get them altered as required.
My basic staples are usually from Uniqlo, and I cannot fault them on their quality, and at eminently reasonable prices.