i really like the brands splendid and c&c california. the splendid ones are made of a thicker material and are super soft and comfy. the c&c california ones are also really soft and comfortable, but they are really thin so they get pinholes easily
I wear white tees by James Perse, Splendid, Vince, and Da-Nang (when they do make plain tees). They're all great! I just wish they didn't get underarm stains so easily...sorry if that grossed anyone out...
JAMES PERSE hands down, I own like 10 of the same plain white shirts. I absolutely love them and wear one practically everyday, under a vest, a hoodie, a sweater, a babydoll, etc...
Totally agree, and I'd also add that Velvet (by Graham and Spencer) are great as well. I've found that Splendid, James Perse, and C&C are made of softer and thinner materials that tend to pill or stretch, although all these brands are super flattering and have great styles.
I personally like J Crew, American Apparel, and Banana Republic. I tend to wear my t-shirts very often since I am a college student and these are the ones that last the longest for me.