I can now only wear flat shoes following a foot operation, and it’s had a big effect on the way I see clothes. For dresses/skirts, I recommend maxi or midaxi length to avoid the frump, preferably with a bit of a flowing silhouette rather than straight or tailored.
For footwear, if you’re looking for something formal, a pointed toe with an ankle strap looks good. As well as the super-comfy Air & Grace, you can also pick up some designer bargains on Vinted - search for Valentino or for the Aquazurra lace up flats.
Spanish and Italian brands online are also good for styles you just don’t see in the UK. Check out:
https://leboffi.com
https://ganzitos.com