A great source for baseball stuff is Ebbets Field Flannels, a Seattle-based online retailer that specializes in minor league replica jerseys from days gone by. If you want a Sacramento Solons or Seattle Rainiers jersey from the heyday of the Pacific Coast League, this is the place to go.
My wife sports a fun Nevada (Mo.) Lunatics T-shirt that I got her from Ebbets at the holidays last year, and I covet a Cleveland Barons replica sweater from the Ebbets hockey collection. Most of the jerseys run at $100 or better, so if you’re on a budget as I am, you might want to stick to the T-shirts and caps.
Ebbets has a terrific selection of caps from the minor leagues and the Negro leagues. The cap collection is well worth browsing at this link. The caps come in a marvelous assortment of teams and color schemes, such as the black and orange beauty at right. It’s a 1940 San Francisco Seals cap.