Givenchy flat slides. Size 38,5

Givenchy flat slides . Used. good condition. Bought in European clothes boutique. box, dust bag. Blue and White Fabric with leather trimming. And gold shade plated buckle. Size 38,5. Please read: (I know it says 38,5, but they runs smaller. 37,5 more like. So American size 7,5-8 is max, I think. I'm 7.5 and look how they fit me on picture from the side. I'm narrow fitted, but have a little bonion, so usually I'm baying 8 for more comfort. They felt push it, like size 8 at max. (I tried to use mejurment in a lenghts to post here. It shows 10, which is for sure not any 10, it would be huge on me. But it seems like this brand runs extremely smaller. or ment for very narrow fit. I just sold boots of this brand, which was marked as size 40, but I was wearing them , and yes, they where a little bit bigger on me, but if a woman want something:))).... I managed to walk in them.. a little:)).., till realized soon enough, It wasn't really comfortable:)) . But you know your fit better.