[ZenGum]

But that means they are, primarily, socks. Within the category of socks, they are modified as being sandal-like.

In English, the chief category goes at the end, and modifiers get stacked in front. I wear blue pants, not pants blue.

I think these are sandal socks.

Or sandal-look socks.

Or maybe we should just call them "nerd feet" and be done with it.