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Jersey tops from Baukjen and The White Company because the quality is excellent.
My forever jeans are Gap Best Girlfriend ankle length. Have them in every colour and wash.
Knitwear from Zara because it's often a bit quirky, or from Cos if I want something smarter.
Weekend casual wear is usually Hush harems and sweatshirts from Etsy.
I mainly wear navy, grey, black and off white, the only colours I wear are blush pink or a soft red. On hot days I wear those v-neck, linen shift dresses from Next with big sunglasses and tan leather sandals from Ancient Greek. Easy and effortless, I think I have about 6 of them 
I avoid Joules and White Stuff because I dislike cheerful, cutesy clothing. I do have a very plain olive green raincoat from Seasalt in their tin cloth fabric which is fantastic quality and cut. Also have several of their plain Breton tops as it's a nice weight jersey. But I avoid their dresses and tunics as they're too 'middle aged art teacher' for my tastes.
I have no idea whether I'm frumpy or stylish, but I often get asked where my clothes are from which is nice.