This Gildan brand tee is a solid choice if you want something simple and reliable.
Papa 60th Birthday Fathers Day Shirt Gifts Tshirt Tee Crew Neck Short Sleeve
A nice touch is the 5XL has a longer shirt tail for tucking.
60th Birthday Oldometer 59-60 Vintage Funny Gifts Men Women T-Shirt
You will find that an unbranded tee like this is a reliable basic.
Legend February 1966 60th Birthday Men Women 60 Year Old Gift Unisex T-Shirt
The round neck is cut wide enough to feel airy but not sloppy at all.
Two-A-Days Collegiate Navy XL New Shirt with tags $60 MSRP
A nice touch is the ribbed cuffs, which men find adds a touch of style.