I would like to know if it's all a void underneath, or is it like a pair of really baggy shorts.
I'm sorry? A void? Oh, you mean the garment.
Yes, it's a void. The topology is the same as a skirt.
This particular model has a "modesty system" which lets you loosely connect the front to the back using a toggle, so the whole thing effectively becomes a giant pair of shorts, but it doesn't do anything for the line, so that's only for high winds and motorbike riding.
The FAQ on that website is hilarious!
The whole site is very cool. I have so far found 3 of George Carlin's 7 words on there, which is fairly anti-corporate, although perhaps not too much so for Seattle.
The kilt comes with cards in the pockets, both the company's business cards (their advertising is mostly word-of-mouth) and a couple with bits of philosophising about the product - one is a postcard which you can mail, with the message partly pre-filled: "Dear _____, Look what _____ just got!", etc. Another card contains this phrase, which I liked: "Wearing a Utilikilt ensures that you are met with minimum preconceptions".
It's very, very comfortable on a cramped coach-class airline seat. Way better than having jeans seams bundled up into your "gentleman's area" for a couple of hours. And pulling off the pockets to toss all your metallic stuff onto the conveyor is cool too, but I did need to walk through the metal detector gate a little carefully after removing my belt.