Vtg 70s Wool Preppy Green Blue Plaid Pleated Midi Skirt Wool USA Union Made

Super preppy, traditional plaid schoolgirl skirt. It seems like its a wall blend, but there is no fabric content label. Im quite sure this is from the 70s based on the design and the labeling, but Im not positive so please check everything carefully yourself. Great vintage condition, no visible flaws to my eyes. PLEASE NOTE: the tag says size 12, this would fit todays size 6 Im estimating but please check the dimensions carefully, the waist is 27.