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.

http://shop.nordstrom.com/s/calibrate-trim-fit-dress-shirt/3135090?origin=sizechart&tn=Sizeandfit_popup

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?