<p>My son is also very tall and lean. We recently found dress shirts at JC Penny that fit him very well. They are the store brand, no-iron, good quality fabric (not thin and flimsy). They come in button down or spread collars in a good choice of solids and prints. They are the slim fit and come in a great range of sizes (we bought 15-1/2, 34/35). They were very inexpensive and have held up very well thru a few washings now. They are better quality than the much more expensive shirts I have been buying my husband- this may be my new source for dress shirts.</p>