Vintage Choir coat, choir deals dress, Parade, Costume, Church Choir.

deals Made in Toronto around 1940 - guessing- beautifully made - lots pleats - and heavy Ruching (Ruching is a fabric manipulation technique used to give a garment texture and dimension by repeatedly pleating and folding the material. Designers use this overlay of gathered fabric to embellish sleeves, bodices, shirts, and skirts)
I'm guessing it's a one fits most size.
Batwing sleeves with the open underarm for full movement and song book reading.
It's vintage has fraying and in used loved condition.