A friend of mine was recently diving on a B-24 which ditched in 1944 in the Adriatic with the loss of most of the crew. In the debris field they came across a boot which had 'King's Size 11' on it and we've been trying to find out a bit more about it.
I've discovered that the Kings Manufacturing Company Inc were based in New York and seem to have made flying clothing up until the late 1980s but can't find any sign of them making boots or being active during WW2.
Anyway, I know that there are some impressively knowledgeable/geeky people on here so was hoping you may be able to assist!
I think the company that made the flying equipment was the Kings Point Manufacturing Co.
There was another Kings which made military dungarees but this was the LC KIng Manufacturing Co.
The Kings Point one definitely made flying kit. Examples here:
Flying gloves: Flying Jackets and Clothing | vintageflyinghelmets
Flying suit: Aviation Clothing, Flying Jackets, Flying Suits, Flying Boots - North American
Fighter jock jacket: https://www.armynavywarehouse.com/product-page/jaclet
There lots of NSNs attached to the KP name so they were clearly a supplier to the US military. However, the company seems to have been merged in 1987 (at least according to official documents I could find). Sadly pre-internet so there is very little information floating around.
Vintage Kings Point kit seems quite sought after.
Sorry but that is about the limit of what I can find. Maybe an American can drum up more info.