well i can tell you from experience a lack of gi does not seem to effect the ability to dump someone on the floor very much if at all, even the cheapest of tshirts wont come off in your hands if you use it as leverage to throw someone, coats, hoodies and even knitwear work just fine, it can be a problem if they are bare chested, so don't get into fights on the beach and those tight fitting heavy nylon bouncer jackets are nearly impossible to get hold of,, so for more reasons than him and his mates beating you to a pulp, dont get into a fight with a bouncer and also buy yourself a heavy nylon bouncer jacket, if nothing else looking like a bouncer is a good look in the taxi queue