1.Do they sell big sizes over 3X? 2.Do they sell bigger than 44" waist pants or shorts? 3.And if they do, is there a big selection in these bigger sizes or just one white t-shirt @ 4X/5X?

Number one yes they do number to Cafe Du Bible 3 different color t-shirts

Yes they do.

Yes they sell sizes bigger than 3x. Yes they sell bigger than 44" Waist for pants and shorts. As far as selection from what I seen yeah they have more than just white t-shirts in 4X and 5X.