Nintendo recently announced that several retailers would be offering exclusive DLC costumes for consumers who order the game through them. It seems that retailers are now beginning to post their exclusive offers, with both GameStop and Amazon Canada announcing their pre-order bonuses.
GameStop is offering an exclusive Ocarina of Time DLC costume pack for both Link and Zelda. If you order the game online, your download code will be emailed 2 days after the game ships. The code will be printed on your receipt if you make an in-store purchase.
Amazon Canada is offering a similar deal, but their DLC consists of the Twilight Princess costumes for Link and Zelda. Once again, the download code will be sent to your email a couple of days after the game ships.
Best Buy has now announced that they will be giving away downloadable codes for the Skyward Sword costume set when consumers pre-order the game from August 6, 2014 through September 25, 2014. Their download codes expires on March 31, 2015.