Summer sandals I love, all in a flat sandal style. I'm a 6.5 or 7 in most shoes, here's the sizing on these styles:
Chloe Woody Slide 37
Sezane Amelia Low Sandal 6.5 (true to size)
Reformation Lake Sandal 6.5 (true to size)
Ancient Greek Sandals 37
Madewell Sandals 6.5 (but runs very narrow, could have sized up 1/2 a size)
Fendi Feel (36, runs big)
LTKShoeCrush