The Parkway Tee from Arianna Soloway uses color blocking and stripes to make a fun sporty top. You could also work the striped section in a solid color or do bigger stripes as you like.
The pattern is available in 9 sizes up to a chest measurement of 64 inches (actual sweater measurement is 70 inches, as the design is meant to be worn with 7-10 inches of positive ease). It uses DK weight yarn and is worked from the bottom up.
You can get your copy of the pattern on Ravelry.
[Photo: Arianna Soloway.]