From
http://english2american.com/dictionary/k.html
kit n. A sports kit (rugby kit, football kit, etc.) is what the Americans call a uniform - it's what you wear while you're playing. More generally in the UK, "kit" refers to the equipment necessary to perform a particular task - usually, though not always, sporting. The boundary is wooly to such a degree that I don't think I can generalise really. I've heard all sorts of things from parachutes to computers referred to as "kit". The phrase "nice piece of kit" is in pretty common usage in the UK, just meaning an item particularly good at performing its task in hand. Again it could refer to pretty much anything, though I think you'd be more likely to describe your new camera as a nice piece of kit than, say, your fiancé.