Goodness! - I imagine you must feel very different (and possibly a little shell shocked) with your new size?
Given that this is S&B it might be nice to wander beyond Em and Ess, Next, and JL. Though I agree Uniqlo can supply all the basics.
Community Clothing will also do that - with added ethical and environmental credits. Correspondingly more expensive than Uniqlo, but …
Then you want
Zara
Colorful Standard
& Other Stories
Cos
Massimo Dutti
For more particular style:
American Vintage
Palava
YMC
And if you want to dress up:
Realisation Par for cool silk dresses.
Tfat would be a start, though the world’s your oyster. Just browse as many (recommended) sites as you can to get your eye in with new proportions, lengths, colour combinations, etc.
(PS I think we aim to avoid the meat phrase on this board …)