Scala Men's Dress Straw 1 Piece 10/11Mm Laichow Braid Boater Hat

how do I know my hat size?May head measures 24.25 inches.

How well does it hold up to sweat?

Is this the real hat or is this a cheaper version of the Hat I would like to buy it for my other half but I want him to have the real version

How tall is the crown?