Always love the material, great for travel.  I order size M and it is somewhat big.  Probably small will work too.  Depends on style, I  take a small or medium in Columbia bottom.  For reference, I am 5'1", 120 lbs.  I like the length, it is perfect for me being short.  Do not care for the ties, do see that I will use them to shorten but will probably cut the cords and burn the ends.  I decide to keep the medium and wear it a bit loose for comfort.

Update: I wore this pair twice and it is pilling everywhere like crazy.  I have a black pair ordered from Columbia, and do not have this problem.  The material is definitely not the same even though the tags said so.  So buyer beware!  I just ordered another pr from Columbia.com since I really like the style and comfort.  I rather pay extra $10-15 for a pair that lasts