I bought a Panama hat on Amazon 7 3/8 with an adjustable strap. A one size hat has been sent with elastic inside, actually labelled size 60? Which I think is 7 1/2 so actually a bigger size. I tried it on it and it already gave me a headache. I think I've measured my head wrong. Are you meant to add a bit on? Any hat head measuring tips? Or recommendations for cheap men's Panama hats?