I've got a hat

I've got the crown decreases down pat!  This super slouchy hat is a success:

I'll get the final touches set and post the pattern here and on Ravelry for anyone who's interested.  I'm calling it Half-Giant Hat, because it reminds me very much of a certain half-giant Keeper of Keys and Grounds.  When it's finished it looks positively huge, but once it's slouched down around the ears and back of the neck it's perfect!  Also, it's probably as one-size-fits-most as hats come.