I like when a shop clearly shows PD, lens height and bridge width in millimeters. It saves a lot of trial and error for everyone else. For light summer tops I keep to my normal size to avoid a baggy look. In the end there is no perfect shop, but some stores are clearly more consistent. The same is true for metal versus acetate frames for glasses.

If anyone is interested in real user experiences, I sometimes write short notes about the shops I test.
You can find one of the pages here:
[url=https://lifeskillsafrica.com/blog/index.php?entryid=192283]
click here
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Good packaging and a small storage bag are also nice touches for accessories. I like when they mention whether the fabric has stretch or not, that detail matters a lot. Shipping speed is not everything, but extremely slow delivery is very annoying. Otherwise they become clutter in the closet after the trend is over.

Hope this helps someone.