vintage 70s hot pink pattern maxi skirt

vintage 1970s hot pink patterned skirt that was my mom's. fun black and white flower pattern, back zipper. skirt is slightly too small for my waist guessing the size is XS-S because I usually wear a S-M (also bc sizing has changed since the 1970s) for reference, i'm 5'8" and the smallest part of my waist measures 28". I usually wear a size 27-28 pants and size 4-6 dress