This adorable set is from the 70's. The vest has an elastic waist with tie front. Buttons down the front. The skirt has a zipper and button closure. A-line silhouette that falls above the knee. The colors are just beautiful, with shades of gray, blue, purple and red. Excellent condition. Best fit would be a XS/S, however, please see the measurements below for a proper fit.
Measurements

Vest
Armpitarmpit doubled 34"
Waist 24"32"
Length 18.5"

Skirt
Waist 24"
Hip 44"
Length 27"

This item is sold from an excellent, highly rated vintage boutique in Westfield, Massachusetts.