First of all not all these shirts are sold by one vendor so be careful when buying because the prices change as well as added postage. With that said I will list what was bought by vendor...
Essential Apparel: Had the fastest shipping time in 3 days it reached here! Amazing!
(1) Shockwave Grn XXL - 100% Cotton (I would say the true color of this shirt would be a bright olive green)
(2) Red Heathered XXL - 90% Cotton 10% Polyester (color would lean towards a maroon with black specks in it)
Bealls: Got it in 5 days
(1) Drk Green XXL - 100% Cotton
(1) Vintage XXL - 50% Cotton 50% Polyester (like a stonewashed denim color)
Amazon: Got it in 9 days with their "Free Super Saver Shipping"
(1)Oxford XXL - 53% Polyester 47% Cotton

As with any piece of clothing more cotton = most shrinkage.  Drk Green > followed washing instructions still shrunk in length not so much in width: would advise to air dry, at 100% cotton that is expected. Red Heathered > Followed washing instructions & still shrunk all over this time but very minimal, would advise here to air dry as well after washing (90% cotton). Vintage > held out like a trooper! Just to give you married men a heads up; if you don't do your own laundry stick with the shirts that have more polyester in them ..... the stains will come out better with hardly no shrinkage. Like the old saying goes "Happy wife, Happy life" she will thank you for it in the long run & you will have one heck of a clean shirt.