Our t-shirt collection is ever evolving... When we print a run of shirts we generally throw in a handful of 3x, 4x and 5x sizes for folks who request them making them rare and sought after. These big and tall band shirts, tie dye, and Grateful Dead shirts are handmade in small quantities at various frequencies so there are occasional issues with inventory that I personally resolve. Please order them while you see them as each style and size may not be around very long... peace... PB.