I have a Barbour waxed jacket that works with everything. That was about £250.
Penelope Chilvers short boots, they last years, they work with trousers or dresses. They were about the same price I think.
COS chunky cashmere jumpers, a navy one would work with anything I think. That’s another £250.
Navy linen maxi skirt, mine is from COS, was about £70, but I wear it all the time.
Uniqlo barrel trousers, £35, they do good T-shirts as well, my other place for T-shirts is COS.
White shirts, I have lots of them, I pretty much live in them. Mine are Boden and White company, roughly £50-70 each.
Me and Em for dresses, I have a couple I always reach for when I’m going out out. For linen dresses I go to White Company.
I walk the dog, go to work, go to the allotment via the shops, friends for coffee etc, I wear the same thing. Only at the allotment I change my shoes for wellies and I have a Japanese apron I throw on if I do some weeding or watering, if It’s just a stop to pick some courgettes etc, I don’t bother with the apron or wellies.
I have a Le Pliage bag for work and a couple of suede bags from The Free People for everything else.
If I wear say the same linen skirt several times in a week, I change the T-shirt/shirt daily, obviously, but I also put on different beads/bracelets/scarf. I like the scarves in Zara, if I’m too hot, I tie them to my handbag.
Belts can make an outfit! Don’t underestimate the importance of a good belt, even if you ‘don’t need it’. I got mine from Massimo Dutti, Anthropologie and the Free People.
Hope that helps.