WranglerRiggs Workwear Men's Long Sleeve Denim Work Shirt

I typically wear an xl in standard shirts, but i want a little more room. Should i go down a size for big and tall?

what is the depth of the pocket? can pocket hold a cell phone and button the pocket?

Would this shirt work well for welders?

i have 49 in waist, chest, any ideas on whats the best fit, with a little give for an undershirt please?