You read...wrong? at least for jerseys...
Dye is about accurate with Carhartt Relaxed fit t-shirt sizing... which is pretty generous.
PE...simply stated - if a Medium fits like a 2X... and I own a 2X jersey because everyeone I know told me to buy large.... and I wear a regular XL t-shirt.... just HOW big is DAYMN???!??
But - if we're talking bounce vests - They're supposed to fit like UnderArmour compression shirts. Tight. Fitted. Close to the skin. They're intended to be worn below the jersey and possibly under a t-shirt. Now -if my ogre-like self can fit in a L/XL Dye jersey, and a L sleeveless UnderArmour compression shirt... you should be ok.
Now - why I suggest against them in a recreational setting - If you're holding proper shooting form behind a bunker - and the people you're playing with bought their own paint...or are the least bit experienced... the odds of getting whacked in the chest vs. the arm/face/marker/shooting-side leg... are slim - almost like getting shot in the twig and man berries. Simply put - most people playing want to save paint for another game, and don't want to light you up - because you'll do it back.
- Logical Reasoning -
If you're wearing something that will increase the rate in which paint bounces, and your opponent knows this... their only recourse is to...increase the chances of a paint break by...increasing the volume of paint headed in your general direction.
- think, try, apply -
So - taking the setup and applying it against the reasoning...
if you're looking at a bounce vest because you don't like the way paint feels when it hits you... you have a predicament. Wearing a bounce vest..while it may reduce the severity of the impacts...opens up possibility for those shooting at you, to continue to do so - as paint won't break as frequently against your chest. What's worse? 3 rounds coming in your direction - where 1-2 hit you, or 15 coming...but don't sting as bad?
....The guy at my field doesn't wear his bounce vest anymore