I'm a true size 38 UK (which from the size chart translates to between a 7 and a 7. 5 US), slender feet, and I'm so glad I went with a 7, being that it's an open shoe cause I didn't want space at the back. They fit PERFECTLY without the foot hanging at the back of the shoe! Whewwwwwww! Also, the front is super comfi; not tight at all!

I am a 8.5 in women's normally but FN shoes tend to run a 1/2 size bigger for me so I always opt for an 8. I was concerned that the pointed toe would make it smaller but the fit is perfect unless you prefer extra room.