Kit out
Definition 1 of 1
Pro Tip 1/3Generally Informal
Used in casual conversation, not in formal writing or formal speech. 
I need to kit out my new apartment, it's pretty empty.
Pro Tip 2/3Complete Preparation
Emphasizes the thoroughness of the preparation or equipping process. 
Before the trek, make sure you're kitted out with all the essentials.
Pro Tip 3/3Activity Specific
Often used for preparing with items specific to an activity or occasion. 
She's getting kitted out for her first day at school.