Keep that jug of beer fresh, tasty, cold, and out of the damaging light with your very own newfangled neoprene East End Brewing insulated "Growler Suit".  There's a zipper on the side, and a strap for your shoulder, so it's not as formal as a regular suit, but it does a much better job of keeping beer cold than a sportcoat and slacks could ever do.  (Strap included, but not shown...hmmm. That's odd.  Don't you think?)