Quote Originally Posted by solobiker View Post
Climbers, as in rock climbers sometimes refer to people with long arms as "positive ape index" and people with so called shorter arms " negative ape index". Essentially what they mean is if when you hold your arms out to your sides at a 90 degree angle to your body and take the measurement from the finger tips of you left hand to the finger tips of your right hand and this number is higher then your height then you have a positive ape index. My husband has a positive ape index and he could just reach his way through some tough rock climbing areas where I had to use my feet more to work my way up.
Good description! And it matches what I read about sweater design and fit. I'm just under 64" tall but my wingspan is 66" so I'm a postive ape.

Shirts sizes may not be a good indcator if you buy larger sizes to accomodate shoulders, boobs, etc., but probably works if you are slim for your height.