Vintage Cache WOMENS fitted blazer/jacket 1 button periwinkle/blue size 1 or L?

Vintage Cache WOMENS fitted blazer/jacket 1 button periwinkle/blue size 1 or L? This blazer has 3 closed pockets and not 100% sure they can be opened. Blazer has padded shoulders & size tag is either 1 or Large. Measurements are 18”(36) pit to pit, length is 26 1/2”. The tag has 2 very small holes from when getting dry cleaned. Good condition and made from 100% microfiber polyester, lining is 100% acetate. Single button closure.