Question: What's with this Chuck Yeager hat? 

How did I get it? What is it good for? 

If I plug it into the mains what colour smoke will I get?

When I wear it it covers my eyes and I can't see out proper like -  

Can I get a smaller version - or an (even) larger head?

Answer: 
Oh dear... *you* weren't supposed to get that hat.

Unfortunately, in a bit of oversight, mods weren't given the ability to delete hats, so I'm afraid you'll have to live with it. (Or click the "I hate hats" link).

All hats are "One Size Fits All". If you're unhappy with the fit, then I'm afraid you'll have to trim your head for comfort.

And *do* be careful with the sound barrier - we only get one per site and the evil overlords don't like it when we break stuff.
A quick Google search shows two threads elsewhere on SO:

* [I have a Secret Hat](https://meta.stackexchange.com/questions/211707/i-have-a-secret-hat)
* [How Do I Get the Winterbash 2013 Secret Hats?](https://meta.stackexchange.com/questions/212799/how-do-i-get-the-winterbash-2013-secret-hats)

As they are secret hats I didn't manage to find an exact answer anywhere, but it was pretty obvious when I found those two threads why I'd got the hat.

And a clue: this answer would possibly qualify.