Shaquille O'Neal Big Fit Men's 2XLT Long Sleeve Button Up Black & White Plaid Shirt Spread Collar. The "XLG" under Shaq's name/label is not the size. It is the clothing line. The size is 18 1/2 36/37. Which translates to 2XLT.
Length 34.25"
Armpit to Armpit 29" (58")
Sleeve Length from Shoulder Seam 26.5"
Sleeve INSEAM 22.5"
Bottom Width 29.5" (59")
Measured in Flat Lay