Board Thread:General Discussion/@comment-5900332-20130313165103/@comment-4062229-20130317114735

No, the new Omnitrix has a modified clothing system, so maybe, since the Incursions have that type of clothing all the time, the Omnitrix gave Ben that clothing. The other possibillity is  that when Azmuth was unlocking Bullfrag, he ordered the Omnitrix to give Ben that clothing.