I am making this, do to the people who PM'd me asking how to get one.
Step 1) Go to: http://xcl.xbox.com/Default.aspx
Step 2) Sign In
Step 3) Click "Loot": http://gyazo.com/dc0322dbc788300a134c79b9dfd9ea65
Step 4) Scroll down, until you see this: http://gyazo.com/47ac3e0288c34b214f712caea155b5a7
Step 5) Click "Xbox Beta"
Step 6) Click the green box, that has "B" and a Xbox controller combined. http://gyazo.com/f698d1c1b0698efbbc6c53697ecd96d9
Step 7) Click The type of shirt you want. (male or female) http://gyazo.com/e3d241e9cc839fc59b663f9a20d243ed
Step 8) Click "Claim loot" http://gyazo.com/5d445dbb7580f5204dd4440a82d2f46b
Step 9) Click "Yes, claim!"
Step 10) Click the code they give you. http://gyazo.com/c135103a773f88ac7e26bbff1f564622
Step 11) Redeem it.
* You can only do this once per Xbox LIVE account.
Step 1) Go to: http://xcl.xbox.com/Default.aspx
Step 2) Sign In
Step 3) Click "Loot": http://gyazo.com/dc0322dbc788300a134c79b9dfd9ea65
Step 4) Scroll down, until you see this: http://gyazo.com/47ac3e0288c34b214f712caea155b5a7
Step 5) Click "Xbox Beta"
Step 6) Click the green box, that has "B" and a Xbox controller combined. http://gyazo.com/f698d1c1b0698efbbc6c53697ecd96d9
Step 7) Click The type of shirt you want. (male or female) http://gyazo.com/e3d241e9cc839fc59b663f9a20d243ed
Step 8) Click "Claim loot" http://gyazo.com/5d445dbb7580f5204dd4440a82d2f46b
Step 9) Click "Yes, claim!"
Step 10) Click the code they give you. http://gyazo.com/c135103a773f88ac7e26bbff1f564622
Step 11) Redeem it.
* You can only do this once per Xbox LIVE account.