This is a Lululemon dark olive-green colored long sleeve v-neck top or shirt with black trim.
Here is a full view of the front of the top. It reminds me a bit of a Star Trek top!
Here is a close up of the top of the front. You can see the v neck collar that has a black trim all around.
Here is a full view of the side of the shirt. You can see that the seams are black threading. You can also see that the sleeves are fairly long, too.
This is a close up view of the small silver omega Lululemon symbol on the side of the top.
This is a full view of the back of the top. It is of medium length.