WranglerMen's Logger Twill Long Sleeve jacket

Q: 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?

Check the size chart. I normally wear an XLT, but find the Wranglers sizing a bit skimpy, however, it _is_ true to what is in the chart.

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

Depth of pocket = 5" Button x 5" wide; 6" unbutton x 5" wide. Can not hold cell phone (button).

Q: Would this shirt work well for welders?

42 years with many welding processes, 100% cotton twill will arrest flames and USUALLY protect from burns, even dual/core wire. Users experience will make the difference. These shirts are my go-to since Duluth discontinued their all cotton twill. They lasted 11 years. Excellent UV and heat radiation shielding. My Riggs test shirt has performed flawlessly for two months. Includes thousands of hot chip hits from turning/milling processes. Just ordered 10 more tan for the warm seasons ahead.

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

3XL was the size I wore when my waist size was a 44 and I had a rather large belly. I believe a 4XL should be just fine. 3XL will not give that room you want. I like wearing my shirts in my pants, if so a tall will help a lot if you also wear your shirts in your pants.