Personally, I'd never go near the games field with one of my "real" kilts for fear of damage or soiling (I've slipped and slid my way through miles of mud LOL ), but I love my Stillwater kilts for games. I used Sport Kilts for couple of years but wasn't happy with them. I wrestle as well, though, and I was looking for something heavy enough and inexpensive enough to be able to trash when I first found them. That was about 3 years ago and I still wear that first Stillwater and it still looks quite good as a knock-about kilt even though I have abused the crap out of it.

10 or 11 Oz would allow for a good deal of lift when throwing hammer and stone, but a 10 oz 4 yard would be my choice if I was having one made for games. I agree that heavier weight or more fabric would be pretty cumbersome. I would think that any of the kiltmakers here could set you up with a Morgan 4 yard for a reasonable price.

I wear a 24" drop Stillwater at games which is actually a smidge too long for my short little troll legs. I wear it high, just above my navel and it breaks at the knee just as any other kilt should.