Check out The Outnet for some bargainous options re silk shirts 😍
I live in the sticks now so a bit out of touch, but my 4 sisters still live/work there; they’d all wear something really relaxed for lunch (and most of the time)... But the main thing is to just feel/be really confident so whatever it is that incites that feeling in you is a very good start
I’d possibly suggest chunky soled boots/loafers or block heel Chelsea boot, crossbody leather bag, chunky/vintage knit and slim trousers, or silk/fine knit bodysuit/top with wide leg trousers, or band/logo crop/tucked T-shirt into leather/suede/silk midi skirt and knee high slouchy leather chunky boots… with leather jacket, Burberry[~esque] trench or a statement dramatic or obviously classic coat (even something like a wax Barbour or Harris tweed jacket) in any of the above situations.
Don’t discount a bold sock when it comes to accessories. Same goes with hair accessories (apropos boldness, not re having hair-sock-condoms 😂)
Fabulous sunglasses always must be ready waiting in the bag during any daytime outings in case needed. (hence the username)
If you’re after dresses then look at Zara or Mango for ideas or rent something. I agree with the pp saying feet first then make it work.
Definitely have very clean shiny hair. Maybe treat yourself to a facial…. Gel nails. Fresh faced/minimal makeup with a bold lip etc. (I’m much trashier, filthier and dishevelled than my sisters atm.. but always was tbf 😂)
Im sure you’ll look fabulous, just feel comfortable and have an amazing time 