Edit
When a character's feet are completely bare, that is, not covered by shoes, socks, thighhighs, or anything else. Barefoot should still be applied to nude, bikini, etc. characters, as just being nude doesn't necessarily imply that the feet are visible.
Use no shoes instead if the character is not wearing shoes, but is wearing socks, thighhighs, or other legwear.
See also
The following tags are aliased to this tag: bare_feet, bare_foot, and barefeet (learn more).
The following tags implicate this tag: single_barefoot (learn more).