You have my sympathy, from the opposite side of the problem: I have a dress form, known as Gloria, set up to DD measurements or to be exact not quite to her measurements. DD is 6'2" tall, RTW size 8/10 with looong legs and back neck to waist of 18.25". Gloria will not extend willingly to any of these extremes. DH has replaced part of her stand with a broom handle to allow skirts and trousers to be constructed to the correct lengths, but the back neck to waist measurement is an ongoing nuisance. I've tried adding padding to the shoulder areas to add inches vertically, but that means the bust shaping is too low for her. Unfortunately as DD lives 'down south' there's no easy answers so Gloria has to be.