How to Wear Yukata (浴衣の右前・左前 - Yukata no Migimae)
The absolute rule when wearing a 'Yukata' (light kimono) at onsen resorts: you must wrap the left side of the fabric OVER the right side (creating a pocket you can slip your right hand into). Wrapping right over left is strictly reserved for funerals/dead bodies.
Inherited from ancient Shinto and Chinese yin-yang principles separating the living from the dead. Wrapping right-over-left (left-hand side underneath) is associated with death ('Kiniro'), a heavy bad luck taboo.
Pull the right lapel across your chest first, then fold the left lapel over it. Secure the obi belt around your waist. Remember: 'Left over Right' is for the living!
What is the absolute golden rule when wrapping a 'Yukata' robe around your body?