I am new to hats, and am currently thinking of purchasing my first real hat. I am looking at several summer straw type hats that look like they would go well with suits or sportcoats. As a newbie, I am wondering if there is a formality scale for hats (like peak lapel is more formal than notch lapel for suits). For example, is a larger brim more casual than a smaller? or is it OK to wear any shape/type of hat with suits or sportcoats?