Mollymorph

Illusion Cantrip (Druid, Bard, Sorcerer, Wizard)
Casting Time: 1 bonus action
Range: self
Components: S
Duration: up to 8 hours
You cloak yourself in a magical veil. Until the spell ends you appear to other creatures as the opposite gender. The spell lasts for the duration, or until you use a bonus action to end the spell. On close inspection, a creature must succeed on a Wis save equal to your spell save DC to discern that it is an illusion.