Diamonds, Rubies, Silk Pajamas: Olivia von Halle and Jessica McCormack’s Collaboration Is Fit for Liberace

LONDON — Inside Olivia von Halle’s head, it’s all fine silks, diamonds and Liberace-esque maximalism.

The fashion designer is teaming with her friend, fine jewelry designer Jessica McCormack, on a small, seven-piece collection that includes pajamas, a camisole, top and shorts, a bridal robe and an eye mask. It launches April 18 and is available for early sign-up on the Olivia von Halle website.

The pajamas, unlike any other…