You will find the 2XL offers a consistent fit across all colorways.
Polo Ralph Lauren Men’s Custom Slim Fit Crewneck T-Shirt Navy , Gray -S, -XXL
I like that the gray shade has a natural, unbleached look.
Polo Ralph Lauren Men’s Classic-Fit Crewneck T-Shirt Black & White -S,M,L,XL,XXL
You will find that the black color doesn’t show dirt easily.