'American Crime Story' Kardashian Kids Have Been Kast

7/15/2015 4:45 PM PDT

'American Crime Story' -- Kardashian Kids Have Been Kast (PHOTO)

David Schwimmer was decked out in his Robert Kardashian get-up on the set of 'American Crime Story' Wednesday ... shooting a scene with the young actors playing Kim, Khloe, Kourtney and Rob.

From left to right, we're guessing it goes ... Rob, Khloe, Kim, Kourtney ... and they're kinda spot on.

If something looks weird here, it's because this was pre-smartphone days. So, yeah ... mini Kim's not taking a selfie.