Everlane is a company I learned about through Jade of Endlessly Enraptured. In fact it was one of the first companies I came across that inspired American Threads.
Everlane is what I think of as a model company for consumers. They are very open about their production, including where products are made and the forces behind that.
Not all of their merchandise is domestically made, but Everlane tees and Sweatshirts are made in their L.A. factory.
I opted for the Cotton V-Neck Tee in Black. At only $15 it was a good start. I created an account and put the item in my cart, but didn't order yet, I was still contemplating the size. A few days later customer service reached out to see how my experience was so far and offer any assistance I needed. Wasn't pushy or forced, it was actually pretty great to see a company that notices it's potential customers before they even make a purchase.
I explained my project and they kindly credited me $20, so shortly after I took the plunge, and ordered the Cotton V-Neck Tee in Black in a size small.
The tee arrived a day before it's estimated arrival, and I put it right on and never wanted to take it off. It's soooooo soft. The weight is beautiful, it's light but not flimsy, and softer than any vintage tee I own. What I really appreciate is the cut. The dip in the v-neck is perfect, the sleeves are just the right length, and the hem relaxes nicely on the hips.
Next time I order I might go for an xs just because when I wear tapered jeans I like looser tees, and when I wear straight leg I prefer them tighter. But that's a personal preference, the fit is as described on the site.
Everlane has a great range of tees and tanks made in the U.S. and I'd highly recommend them. They're great basics, and $15 for a perfect t-shirt can't be beat.