This chic little blouse was made by YSL Yves Saint Laurent Rive Gauche.  No content tag, but we suspect this is silk - it's super soft and luxe!  In excellent preowned condition, we note that the original removable sleeve cuff buttons are missing, however there are hidden snaps which close the cuffs.  Tagged size 34, this measures, taken flat: shoulders - 16in, bust - 34in, waist - 27in, hips - 34in, sleeves - 24.5in, length - 25in.