"Swingwing Pilot" is pilot slang. An airplane is considered a fixed-wing aircraft, and since a helicopter doesn't have fixed wings, it's a swingwing aircraft :-)
For this set, I made the shorts first, and couldn't decide what to put on the navy shirt. After searching through designs, I found the Batman symbol and it seemed to fit.
Hopefully Sean gets lots of great playtime out of these 2 outfits. I'm also sending another book on tape recorded by me. Just have to decide if I want to read "Where the Wild Things Are" or "Alexander and the Terrible, Horrible, No Good,Very Bad Day"!