Green’s Dictionary of Slang

kitted-up adj.

[kit n.2 (2)]

dressed, clothed.

[UK]Indep. on Sun. Travel 11 July 9: We got kitted up and on the bikes.
[Aus]L. Redhead Thrill City [ebook] I was kitted up in a denim mini, off-the-shoulder embroidered peasant blouse and sombrero.