Vintage Helen HSU N.Y. Knit Polo Dress Black XS

Vintage Helen HSU N.Y. Knit Polo Dress Black. Feminine size XS. Midi dress with a collar. Made in the USA. The knit reminds me of a St. John Knit. 

Measurements with the garment laying flat:

Pit to pit: about 18 inches 

Waist: about 17 inches 

Length: about 38 inches