I don't think that either. LOL. It's coincidental that he hasn't been caught on film yet, I'm sure. It won't be that different from the last two movies in any case, probably less flashy and more rustic/worn. No reason for them to purposely keep his costume secret other than they are trying to keep everything secret (and not always succeeding!). Maybe if we're lucky we'll get another snappy Midgardian outfit too.