Add a hat band to it to weigh it down. I did that with a really cheap Ebay Chinese broad brimmed hat. My hat band is made of Norwegian one kroner coins that h

Add a hat band to it to weigh it down. I did that with a really cheap Ebay Chinese broad brimmed hat. My hat band is made of Norwegian one kroner coins that have a hole in the middle, Some colourful string and fifteen coins makes a band heavy enough to keep the hat down most of the time. But sometimes that isn't enough so I added a stampede string (actually a bootlace) with a toggle so I could strap it tight when it's really blowing.