Any other clues would be helpful in dating--ie waist/hip/size measurements, fabric type of any lining, type of seam and hem finishing, placement of zipper and whether it's metal or nylon, etc. Also, is that a faint numeral 8 I see on the belt?
The "Beverly Paige Originals" label started appearing in the early 50s, and the line's focus for the next 2 decades seems to have always been skirts--plaid, pleated, tweed, circle, you name it--as well as maxi skirts, palazzos, and long dresses in the early to mid 70s. Not sure what happened after that!
I found a 1972 ad for plaid wool Beverly Paige skirts in which the length/proportion of two seemed quite similar to yours. I love the pocket detail on yours!