Thoughts on The ReVelvet™ Penny Loafer

First -- I am sometimes a 6 and sometimes a 6.5 .. and my feet are a little wide (not wide enough for wide widths) and my instep is a little high. What size do you think works in these for me?

Secondly -- Do you think this fabric works for summer or only fall/winter? I'm in NYC if that matters.

Thanks!