(This is an edit of a previous post mistaken indetifying the regiment(s) and the dancers.)
The comments that follow were posted in response to the initial, mistaken post.
[Moderators should please feel free to delete the whole confused topic. I'm not sure how to do this or I would.]
For the record a NYCB house prog. cast from this period shows that Lopez seen here was in Mazzo's Dress Macdonald Regiment; Caligari also seen here was in Macdonald of Sleat; the lighter plaid tartans of Farrell's R.A.C.F. regiment might be those seen toward the photo's right.