No, as a former British Army Infantryman I am telling you that no it's not "the full kit". Kit: "a set of articles or equipment needed for a specific purpose." you wouldn't call it a first aid kit if it was just the bag.
The armour comes in multiple Mks, each one had different sized plates and plate locations in addition the fitting was a little different.
So no I can't just "find a retailer" you chopper. It's amazing how you think that the occassional guff that comes out of your mind some how elevates a jack like you into thinking you know what you're talking about.
It's almost like the retailer with a modicum of effort could have placed these basic bits of information in their advert like which Mk it is and which sizing guide correlates to that Mk, and the plate sizes appropriate to that Mk so that when someone "finds a retailer" they purchase the appropriate items.
Gosh that would be complex wouldn't it....