1) Create OKCupid profile, decently fleshed out (this will take some work on your part).

2) Answer questions until you get "How often do you walk around barefoot?". This will take time, unless you manage to find it on someone's profile.

3) Join the A-List (this will require money).

4) At the search screen, select Advanced, then Question Answer (this is what you need the A-List for).

5) Select the Barefoot question, then select the "Always" (and maybe "Often") answer(s).

6) Cry yourself to sleep when they're all 30% or less matches.

I got creative and lowered some filters. ALL the filters. 18-80, located anywhere, online in the last year...

Then I switched tactics. It stood to reason that if a girl were a barefooter, she'd make some mention of it in her profile. So I took a more brute-force approach, adding in "barefoot" as a keyword, then searching (via ctrl+F) every resultant profile for the word, and reading its context.

I got 22 results, and I'm not sure about half of them - that is, not sure if they qualify as "barefooter". Also, there was one trans, but I'm not counting... them.

I've broken them into two categories: the first, I excluded "overweight", "curvy", "full figured", "a little extra" (because those usually translate to "fat", which I have no interest in), and "used up"; the rest are what that initial sweep missed (with some that never listed a body type). A question mark means I'm not sure about them.

I realized this was kind of a weird thing to do halfway through, but figured "fuck it, might as well keep going." If one of these girls lives near you, and you have any sense, you won't mention this list. Actually, you probably shouldn't mention this at all. Just... look at these 22 profiles, and if they live near you (and/or have a high match rate), try to strike up a conversation with them. Assuming, of course, you're already on OKCupid in the first place.

As a final note, I fiddled with some other dating sites and OKC seems to be the only one with a keword/search function.