Everlane uses tall, very thin fit models, so one has to keep that in mind when ordering.
For example, for the Cotton Vee the model is 5'9" and wearing a size small. It hits her mid-hip. So, if you're shorter, it's going to be longer.
I do like the v-necks tees. I'm pretty small (5'3" slim build but athletic shoulders), and sometimes the XS is too big (tanks can be overall blousy, for example). The T-shirt material seems flimsy but has held up quite well.
Their size guides for each garment are nice because you can lay down a tee that you have and love on the bed, take the measurements, and see how it compares to the Everlane dimensions (they give dimensions for the garments rather than for the person).
TL/DR: You may have to order a couple of sizes, and you may not wear the same size in all styles. Not what you wanted to hear, but there it is.