I'm thinking of wearing a jacket on stage, as part of my stage apparel. I've been looking them over on eBay, and I'm sure I could pick up something for a reasonable price. Problem is, I'm only guessing at my size. I'm guessing I'm a 48 long, but I havn't bought a jacket in many years now, and my body has changed since then (and not for the better!). My question for all you bass-playing haberdashers out there is how do I measure myself at home so I'll know what size jacket to get?