Brooks Brothers women's two-button pinstripe navy

This is a pinstripe blue blazer buy Brooks Brothers in like new condition. It has three outer pockets and one inner pocket. I'm not sure of the size but please see the picture with the tag. The shoulders from seam to seam measure 15 and 1/2 in. And the waist at the smallest part is 16 and 1/2 in. The sleeves measure approximately 24 and 1/2 in from the shoulder seem. The length measured from the neck seam not including the collar is 24 in.Armpit to armpit measures approximately 18 in.