Couple being tall and thin along with having a long torso and things get exponentially more difficult. I've heard that Spidi and Dainese are longer in torso, but Alpinestars is shorter. I haven't tested this info as I haven't started shopping for a suit yet, but I'm SO looking forward to it...
I'm really glad my track day was near the end of the season so I have all winter to try on lots of ill-fitting leather suits...