Actually, almost thrice. I made this hat recently in green. I love this pattern by Suvi. The first time I used Malabrigo. This time it's in Mission Falls 1824 wool. They both say 18sts=4" on their labels, but the Mission Falls is really much heavier and thicker.
This knit up bigger as a result and I worried the whole way through it would be ginormous. It's for a friend of mine so I didn't want to flirt with disaster like I do all the time with my own stuff. Through sheer stubbornness I kept going, but yesterday I cast on for a back-up one in navy Malabrigo since I knew how that would turn out. But I didn't need it after all. When I finished this one late last night it didn't seem as bad as I'd feared and even in the more rational light of day it remains a bigger, heavier but completely wearable hat. Yay! My friend says she likes it. I don't even think she's just trying to be nice.