I'm looking to buy a sports jersey on ebay and a few that I might get end tonight. Do the jersey's usually run big? small? I know that each Jersey size is different depending on the product line but I'm looking at a authentic majestic size 52 (xxl). Normally I wear a xl or xxl....kinda depends on what i'm getting. Any advice?

ya i'm aware of that and i do my research on the buyer. Any advice on what size to get? do they run big? small?

I always purchase one size bigger. I wear XXL just to have extra comfort when it's hot. The way you can tell a MLB jersey is authentic is if the MLB logo is on the rear top of the jersey below the neckline. Also, if the material feels too slippery and thin, that means it is a replica or fake.

Good luck!

Be very careful when you get jerseys on E-Bay. There are a ton of sellers taking authentic tags off of jerseys in department stores and placing them on replicas and calling them authentic.

Make sure you get one that can be returned.

Go to a nearby sports shop and see if they have any MLB jerseys there. You can look at them and see if they would be a good fit on you. Then look on eBay for your size. I argee with the first answer as well, there are many sellers selling fake jerseys so make sure you take a close look at the pictures they display. NEVER buy an item that doens't include a picture.