The super bulky Loa didn't have much give, and I did not incorporate any ribbing into the hat. And, after having looked a lifetime for hats big enough for my head, I err on the big side when making hats, "just in case." In case of what, I don't know. Sudden head size mushrooming?
So anyway, after a couple of years, though it still looked fine, K.'s hat had stretched and become much too big to wear comfortably, despite the adjustable "hat belt" I had knitted to go with the hat, complete with mother-of-pearl buckle. I finally convinced K. recently that she should return it to me for adjustments.
In a move that was half-hat chiropractor, half-hat plastic surgeon, I tightened its sagging midsection with the judicious application of elastic thread. It worked great, and brought the hat circumference almost to a Scarlett O'Hara-like 17 inches. I believe that the operation succeeded, the hat lived, and will fit much better now. Elastic thread is my new favorite knitting toy!