I have worn unisex shoes almost my whole life. Well, mostly men's I guess, things like converse, vans, etc. (hey, they're comfortable) but they have always also listed a woman's size so I had a pretty good idea of what I was looking for. My feet have shrank over the past year, a combination of weight loss and maybe HRT I guess. I used to wear a (US) men's 9.5 or 10 two years ago, which should be around a woman's 11. Today I fit anywhere from 9 to 10 in womens. I do have more weight to drop too, so I'm hoping I will drop to 8.5 in the end. For the most part I have been lucky with guessing, the few misses that I have made in blindly purchasing have been on cheap shoes, so it doesn't bother me that much. But the shrinking has been awesome because I bought some boots 6 months ago that I couldn't squeeze myself in to, but now they fit great

It also means now I need to buy more shoes since I don't really fit what I did have. At least that's the excuse I'm telling myself

Oh but I wanted to add - I don't know how the inches to size thing could possibly be correct. Maybe as a
very general guide... My right foot is a full inch shorter than my left foot, which according to that chart should put my right foot 3 sizes smaller. In reality it's maybe half a size smaller, but it's not like I have to duct tape my right shoe on every morning.