Yes, there is a scene after the parent's death between adult Elsa, in that dark blue outfit, and the 'head troll'. I don't recall Elsa speaking in it. She just stands in the centre alone as he says some stuff.
That's then followed by Anna waking up at the start of For the First Time In Forever, Elsa then joins her on stage for her lines at the end of that, still in the dark blue costume.
There's then a scene not in the movie between Hans and Anna meeting where he sings, before the coronation where Elsa then appears in the coronation outfit from the movie (The black and green one with pink cape).
In Let It Go, that outfit transforms into a sparkly ice blue dress as in the movie. We only see this for about 10 seconds before end of Act 1.
In Act 2, I'm fairly certain it's the exact same dress, just with an added cape. We only see this For The First Time In Forever Reprise in the (non existent) ice castle.
When we next see Elsa (after Fixer Upper), she's in the 'ragged' ice dress. To clarify, by new I meant new compared to the movie, I think it's been in the this show from the start.
She then changes back into the Let It Go dress (not sure if it's with the cape or not) for the bows.
Thinking about it now, the 'iconic' dress as you say is probably only seen for about 3 minutes (last few seconds of Let It Go and For The First Time In Forever Reprise)
Hope that helps clears a bit up!
Updated On: 9/6/17 at 01:15 AM