All during May and into June, I’ve been noticing the strangest seasonal fashion: wool cap paired with shorts. I certainly appreciate the start of shorts season, and maybe these men find the wool cap allows them to bare their legs earlier. I, on the other hand, have long packed away all my woolens.
Best part of this photo is that his hat matches the train, and his shirt the platform tiles.
Tokyo Moe 
A variation on the shorts-and-Uggs look?