Scrubs are always a good alternative to coveralls or a flightsuit. The CRLs just say whatever you wear under your vest/armor has to appear to be a single piece, so matching scrubs are great, especially in outdoor summer troops where coveralls can be hot as blazes.
Depending on your body type, whether you go with scrubs or coveralls, you may end up at a tailor's for alterations. Whatever you wear under your armor and vest should be fitted without being tight, but it shouldn't bunch up, either.
I also wear a full-length cape and I use snaps to attach it to my vest at the collar. If I decide to go with a backplate only, I have caps that cover up the snaps.