Stephen, It's nice to see an 18th century subject. Though size could vary to a certain degree, look at men's hats in period paintings. give a smaller hat a try next time, if for anything else to see how it looks. As for the back of the coat there is typically a pleat on either side of opening of the back bottom portion of the coat. This black and white illustration is of a coat from the mid 1740's. The style did not really change much (if at all) between that period and the 1750's. You might also note there is some additional trim on the coat, although the amount of finery on a coat depended on the wearer (and his pocket book). ~Gary