Apt 9 sweater cardigan with attached silky feeling blouse underneath, sequins

Sweater cardigan with satiny blouse underlaid, sequins on blouse, size tag is missing, guessing it might be a medium? Please see measurements and ask any questions below Across shoulders - 16” Length (top of collar to bottom hem) - 23 1/2” Chest (taken right at underarm & not stretched tight) - 17 1/2”