hi there,
there are many companies now making longer undershirts that are narrower in the body and stretch to conform to a large variety of body types.
the combination allows the undershirt to fit close to the body and stay far enough tucked in so the undershirt will not bunch or come untucked during the day.
while there are a growing number of companies that are starting to make undershirts with "longer tails", there are a handful of manufacturers that started pioneering stay-tucked undershirts back a couple of years ago. they include duluth trading company, tommy john wear, ribbedtee, as well as american apparel.
if you search on the web for "long undershirts" i'm certain you'll find what you are looking for. otherwise, please feel free to visit my site for more information about undershirts.
good luck in your search!
best,
tug
undershirtguy.com