In your situation I would probably think of things in terms of a formula, simple items that work together in a sort of uniform style.
I would start with black trousers in a style that’s comfortable to you (I like a wide leg). Then I’d add 3 tops, perhaps black 3/4 sleeve top, white blouse, white smart T-shirt. Then, add something on top in case it’s cold (offices are so variable) so a smart knit (maybe in burgundy if it’s taken your fancy) could go on top of the top and T-shirt, and then perhaps a jacket that could go with all three.
You now have a simple, perhaps a touch boring, but absolutely practical work uniform that you can rotate. Most of it will work when you drop a size or two. I’ve lost a few sizes and mostly wear the same tops and jackets, but have had to buy new trousers.
With larger boobs I find a gentle V neck works well.
Your trainers are lovely, I’d wear them, but I wouldn’t wear them on day 1. So I would add a black flat shoe, I like a point as it lengthens my legs and just somehow looks better.
I am in the office two days a week. The majority of my work clothes are now black or white and the tops all work for out of work top. Everything matches, I get nice comments, and I don’t have to think about it much in the morning.
Good luck in your new job.