I can see where that would be an issue. However, Mary Ann can easily make something according to your specific measurements. Although the size XL waistcoat in the link above would probably fit okay, she's making one based on measurements that I gave her.
I have been to Jas Townsend's website often, and the quality looks good, too. I just like to give business to the small mom-and-pop businesses whenever possible, and Mary Ann's prices are very competitive (IMHO).