bballgrl247 wrote an answer about The North Face Boundary Triclimate Jacket - Women's on November 5, 2012
Hello! I am about the same build as you, but in my late teens. This jacket would have fit me in a small and an extra small, but the area where you would bend your arms (the front part of your shoulders) was very tight, so I went with a medium! That way you will also have room to add another sweatshirt underneath! Hope that helped!