My opinion is the team's shop itself if you want authentic, true clothes without the thought of being deceived. For instance, if you wanted a Sacramento Kings jersey, just go to the website called Kings.com. You can also try NBA, NFL, MLB, NHL, NCAA, and MLS (with the ".com" at the end).
You can find it on ebay, Champs and the site for the league which the team is in such as the NFL or NBA
You can also try places like Modell's Sporting Goods. I believe the website is called Modells. They always have awesome prices for everything. The website called CAFEPRESS is an AWESOME site for any type of clothing with logos; no matter what your cause. They have team logos, presidential, green earth, etc. Check it out and see what you find. Teamsportswear! You can cutomize it yourself! hsn has genuine team apparel for men and women. Also wall hangings and stadium blanketsFor playoffs and championships, winning teams items are generally available in 1 or 2 hrs post-game for ordering. View the related links below for more sites.
Online
PBS kids has an online shop where you can buy Caillou clothing.
If you want to buy your ski clothing online you could check out online stores like Overstock or snowsportswearonline. If you want to buy your clothing in an actual store, check out Snow Republic.
You can browse FashionTiy.
You can buy Avril Lavigne's Abbey Dawn clothing line from Kohls in the US, or online.
There are many online options for purchasing Carhartt clothing. You can find discount Carhartt clothing on internet websites such as eBay and Amazon Online.
One can buy Caterpillar clothing from Caterpillar's official online shop, or from other online shops like Amazon or eBay. Also, many thrift shops could have Caterpillar clothing items.
You can get Fitness clothing online from lululemon and from Ice gear apparel. You can also buy it online from amazon and at the website of department stores like Macy's.
You should proably find an Italian based brand of clothing you like.
Retail haberdashers, online, clothing accessory shops.
New Moon clothing is extremely popular and many stores are crammed with them. You can buy them at a local clothing store or a mall. You can also buy clothes for a bargain online at trusted online shops such as eBay.
Vintage clothing stores, Journey's, Zumies, Pac Sun, online works too.