I have several of these from Picco Casa and I love them! Make sure you hand wash though.

PiccoCasa 100% Pure Silk Pillowcase 550TC 22 Momme Natural Silk Pillow Slip Soft Breathable Both Sides Silk for Hair and Skin with Hidden Zipper, Standard 20x26 Inch, Peacock Blue https://smile.amazon.com/dp/B081J2PYVQ/ref=cm_sw_r_cp_api_i_iLZCFbA2H2ZAE