Trenches are HOT for fall10 and Long Tall Sally has you covered.  They have 5 different trenches on hand with 'just right' fits that won't leave people singing tall girl in a little coat.  My fav is the Vanessa Trench (2nd from the left) because it comes in a neutral stone color and can go with anything.  I'm ordering my trench today...you should too:)

TALL TRENCH COATS at Longtallsally.com. Left to right: Trench Coat ($265), Vanessa Trench in stone ($135), Rodmill Trench ($85), Vanessa Trench in blueberry ($135) and Dover Trench Coat ($175). Sizes 6-18 (depending on the trench).