I don’t know.
By that I mean I have never had a pair of shoes that fit well.
The pair I currently wear most often are a 7-wide, from Walmart. They’re old-lady shoes, with a wide toe-box and memory foam insoles. My heels slide out of them when I walk, so I know they’re too long, but the size below were too tight on the sides.
If my feet were normal-shaped, probably a 6, 6½.
I have a severe hallux valgus deformity that’s only getting worse with time. I should, theoretically, talk to a surgeon about getting them fixed, but there’s no real guarantee that the surgery will solve the problem. I’ll likely still be in chronic pain and the deformity will likely grow back over time. Meh.