Sportswear Systems shirt XL button up down chest pocket 100% silk VINTAGE 80s?

Silk button up (button down) shirt. Pocket on right chest. VINTAGE! 80s? Brand: Sportswear Systems Size: XL Made in: China Materials: 100% silk Condition: Good. Pulled threads sprinkled around. Spots including on front right of pocket & back lower left, lower center, & center bottom hem. Flat measurements in inches: Width (A): 26 Length (B): 30 Colors may be different in person than on the screen. Measurements are approximate.