Most people would agree the best way to prove your pinstripe pride is by investing in a jersey. That's tough to disagree with, but an authentic baseball jersey isn't something you wear often outside of Yankee Stadium.
So what else is there? Hats, t-shirts, polos, hoodies, jackets or even sneakers are available. Maybe you aren't interested in the Yankees apparel, but you love the collectibles. From baseball cards to bobbleheads, there is something out there for any Yankees fan collector. There are tons of other ideas at the MLB shop online.
I try and buy just about everything Yankees. Here's my list of Yankees stuff I own off the top of my head, but I'm sure I'm forgetting a few things.
Derek Jeter jersey
Derek Jeter signed ball
Brian Cashman signed ball
Charlie Hayes signed picture (last out '96 WS)
"27th Heaven" NY Post cover framed
2,000 Baseball cards (approximately)
12 pennants (maybe more)
Lou Gehrig & Babe Ruth picture framed
1996 WS Champions picture framed
Derek Jeter picture framed
2 Derek Jeter pictures unframed
2009 WS DVD
Hand-sewn pillow case
2009 WS welcome mat
2 helmet bowls
That's about it, I think. Feel free to post anything interesting you have in the comments.