Utterly pointless stat.
Hearts are the designated home team for the semi, and they don't usually allow maroon & red to be worn together (even though they likely wouldn't clash), so safe to say we'll be in either the black & gold, or the granite strip.
Aberdeen have - at least as far as I am aware - never won a semi-final at Hampden wearing their away strip.
1994 SC semi: Drew 1-1 with Dundee United at Hampden (conceded last minute). In the replay, this time we were back in the red while United wore their away strip, but we lost 1-0.
1996 SC semi: Lost 2-1 to Hearts (both teams wore away strips).
2008 LC semi: Lost 4-1 to Dundee United (was at Tynecastle rather than Hampden).
2018 SC semi: Lost 3-0 to Motherwell at Hampden wearing a blue kit.
So the question is, have we ever won a semi (or final) at Hampden wearing an away strip?
It should be said - we have won at least one semi-final in an away strip. In 1947 we beat Hearts at Easter Road in the League Cup semi, while wearing an unusual blue top with white sleeves.