Did you claim the bounty in the game, from the stature, for the shirt?
If so the next step is to go to your profile on Bungie.net and enter the Moment of Triumph section - the code will be there.
If you never claimed the T-shirt bounty in game, though, there is unfortunately no means of doing so any longer since Solstice has ended.
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You are a life saver. I did get the thing from the statue, just wasn't able to actually get the shirt until now. Thank you for the help!!