Estate Sale Find!

Interesting costume or band uniform found at an estate auction. I have no information on this two piece set. If you have seen one like it and know what it was used for, please let me know. Made of black wool. Looks like it would fit a size small woman, or maybe an older child. Handmade. No tags. 

Measurements: 
Shoulder to shoulder: 17 inches
Shoulder to waist: 15
Sleeve length: 15
Pants waist: 14
Pants waist to hemline: 35.
Inseam: 21