Which style of high top? I'm a US7 and wear a 36 in the Slides but a 37 in the 2.12. I don't have the Francy style, so can't comment. My foot is on the narrow side but not enough to require a narrow width in every shoe.
Which store are you buying from? I usually don't see GG sizing listed that way. Instead sizes are usually listed as US7/IT37, US8/IT8, etc.
Yes, that's why I was confused, since I have ordered shoes and there seems to be no consistency.
My Givenchy and Vince slip-ons are a 36 and fit great, while I ordered a pair of 36 Manebi espadrilles from NAP and I couldn't even fit my feet in to them. The Birks I ordered were from Bloomingdales and for some ungodly reason they list in US sizes. I should have known to go with the US 6 - because the 7 translated to a 38 euro (on the box.)
The GG I'm looking at are Francy's from Farfetch. I am just scared that they would be tighter and getting a 38 (or US 7) would be better. That Manebi incident scared me.