We went to Menorca when I was 8 or 9 and we got to Edinburgh Airport and there was a family of 4 checking in front of us. The dad had a full Celtic tracksuit on with matching polo, the mum had a Celtic top on and the two wee boys had full kits on.
On the return journey they had different tracksuits/shirts/kits on but still looked like the Celtic club shop had threw up on them. Almost like it was their official family travel attire