Heroes Clobber outfits are available either in the newly opened store within the club itself or via the SecondLife Marketplace.
Use this SLurl to visit the Store in Second Life

You can also use the link below to view the outfits online, and then visit the store inworld and even get to meet the owner/designer of the outfits in person.

Heroes Clobber… Dress like a superhero. Spend like a miser!