Most likely vintage 2 piece Due Per Due 2 piece long sleeve low mandarin collar heathered plum button jacket, and coordinated scoop neck mauve sleeveless top, both size 16W.
The jacket is a two tone dark plum and medium mauvey plum color made of 55% linen/45% silk, it has snap in our out shoulder pads.
The popover cami top is mauvey plum with a semi satin sheen made of 77% silk/23% linen, both pieces pop and blend with black pants or skirt, both in excellent condition.
Following are the flat, relaxed external, closed measurements, some of which are doubled:
Top-Bust-pit to pit-48" Waist Area-47 1/4" Bottom Circumference-50" Length-24"-has 3" side slits
Jacket-Bust-pit to pit-49" Waist Area-49" Bottom Circumference-51 1/2" Length-28"-has 2.5" side slits