Shirt size guide

On the Styleforum website I saw a link to the Nordstrom website.  They have a really useful page with measurements for the different chest sizes and waist sizes of different brands of shirts.

From their analysis it looks like Hugo Boss is the slimmest.  Note that their measurements are garment sizes, which probably explains why they have Thomas Pink Slim Fit as a 45′. The Thomas Pink website has their 16′ Slim Fit shirts at 41.7 inches, which is a chest measurement.

What do you think? Do Hugo Boss produce the slimmest shirts?