There does seem to be something almost supernatural about this bottom: impossibly airy light fabric, hems have been heat molded to be utterly seamless, and the boyleg shape is designed for utmost comfort without too much coverage. We're feeling downright witchy. Oh, the power of the supernatural.
Basics go Brit with this stellar UK designer.
Hand wash in lukewarm water with an extra-gentle lingerie wash; gently squeeze out excess water and lay flat to dry