resize hat too large - completed

How to resize hat too large once completed? It appeared to fit innitially, but the yarn has stretched so much that you can literally spin the hat around on one's head. Can I save my hat by resizing somehow? I'm a new crocheter and the hat was a stretch for me, so please keep it simple with lots of detail. Thank you so much for saving my hat! :-) newby

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I some time use the narrow Elastic to weave an item to re-size !
This will give some stretch to place on your head and yet fit !
I also use Yarn or thread to work on flat items to reshape !

Best to You !
Mother Hen 1 <><