Well it is pretty simple actually. Apparel is another word for clothes so if you were to replace the word "clothes" in a sentence you could say "apparel" instead. ex: The store sells clothes. The store sells apparel.
You can purchase football apparel at any sporting goods store or online. There are numerous options for sporting and football apparel locations. There are the NFL website that sells different football apparel as well as other items.
There are a number of brick and mortar stores as well as online shops where one can purchase women's tennis apparel. Sport Chek carries a good stock of tennis apparel for women. One can also purchase women's tennis apparel online on sites such as the Nike and Tennis Apparel websites.
Logo apparel are very helpful marketing tools. As the world of marketing and advertising becomes even wider, anything that can be printed on apparel can be used as marketing media. Logo apparel are tools to build brand awareness. They also serve as a walking advertisement.