This is a common technique in the traditional Japanese styles of jujutsu, but my post was limited to techniques that I feel I've proven to be viable by sparring them against experienced grapplersWhen the contestant is bare-chested, are you allowed to grab a handful of skin in place of the Gi?
Aside from the odd experimentation I can't say I've tried the skin grabs in that context (as I like my training partners and want to keep training with them) although I don't doubt that they will be effective as long as your opponent has "grabable skin"