<img src="http://tallmoms.com/wp-content/uploads/2010/02/ruffle.jpg" alt="Ruffle-Top" class="pic fl" />Ever tried <a href="http://www.shadeclothing.com/">Shade Clothing</a>? They are not specifically tall-sized, but their shirts often have extra length in the torso.  For fitted tops with a defined waistline they may still fall short, but I have had good luck with their regular knit tops and layering basics.

Buy Online: <a href="http://www.shadeclothing.com/womens-clothing/modest-tops/ruffle-top.html">Shade Clothing</a>
Price: This one is $18.99, others vary