This The Sound of Musik screencap contains
geschäftsanzug and business-anzug.
There might also be
pianist, korrepetitor, accompanyist, begleiter, liedbegleiter, anzug, anzug der kleidung, dreiteiliger anzug, and dreiteilige anzug.
Here's a video comparing Maria's blue chiffon dress with the Edelweiss Patterns version of "Maria's Gazebo Dress".(The reproduction dress is available at link