I read recently that Affliction LLC (they make apparel popular with rock stars and athletes) will be moving to Seal Beach in August.  They acquired a 50,000 square foot building in the new Pacific Gateway complex close to the Boeing facilities.

The new headquarters complex will be used by their research and design, administrative, sales and marketing, and warehousing.

Orange County is home to specialized apparel makers like Quiksilver, Billabong, Oakley, and Vans.  There are others, but these are the big names.