This is a women's Ralph Lauren Slim Fit Knit Oxford Button Down Long Sleeve White Shirt in Size LG.  See measurements as this is a slim fit.  Note, there is some 'sticky' residue on the front left side of the shirt.  Appears to be left from a size sticker on the shirt.  It appears that this was never worn or washed. Also note, this is somewhat see through, as shown in some pictures, the inside label is visible.