I've been wearing the biker/trucker wallet for years. I replaced the chain with 12 inches of chain I bought at Home Depot. I get plenty of looks and I tell people it works in three ways.
1) I will know if someone tries to grab my wallet.
2) I won't loose it on a ride
3) If someone tries to grab it, I'll use the chain to beat the hell out of them.
Too bad the damn chain doesn't help you remember your wallet though, walked out of the house without it this morning!
"By failing to prepare, you are preparing to fail." -- Benjamin Franklin