If you refer to something as a cloak, you mean that it is intended to hide the truth about something. Preparations for the wedding were made under a cloak of secrecy
This sleeveless outer-garment was worn draped over the shoulders Usually of a heavy wool, it could be made of the same materials as the suit Cloaks might have no collar at all, a square "sailors" collar, or a hood Length varied from waist to mid-calf for men, and from waist to ankle for women It was unladylike to show any ankle!!!!
A loose outer garment, extending from the neck downwards, and commonly without sleeves
To cloak something means to cover it or hide it. the decision to cloak major tourist attractions in unsightly hoardings The beautiful sweeping coastline was cloaked in mist