I've self-measured for my kilts, but I am currently enjoying the opportunity to have a tropical-weight kilt jacket created in the manner you describe.

The process has involved a comfortable chair at the back of a small men's clothiers in Savannah... lots of conversation accompanied by tunes from the owner's great collection of jazz vinyl and the soft "thrum" of a sewing machine in the back room, perusal of photographs and swatches of cloth, careful measurements and usually, before the session is over, a glass of wine or two. Eventually there will be a jacket... but in the meantime, what's the rush?!