According to the research on the perception of biological motions, in which the subjects view videos of moving figures wearing point-light displays in the dark, subjects are better at identifying themselves than friends or colleagues (cf. Gibbs, 2006). Why can they do so? What subjects see is how they look from the outside when walking. We see the gaits of friends and colleagues more than we see our own.
Probably we are able to translate our proprioception to the visual image. Proprioceptive sense of our own body cross-modally informs the visual perception.