Would like to make a few contributions to the thread. Firstly, I'm 6'4" weighing around 170lbs (used to be 180...slacked at the gym over the last few years!). Presently a 33 waist and 39 chest, 36 inseam.
For shirts, the no-brainer I've experienced is MTM. Used ModernTailor thus far with good, cheap results.
Was looking around for a while for undershirts. Finally purchased some MT (medium-tall, not modertailor haha) white v-neck ones from LandsEnd. Not a bad deal with the 40% off they had a while ago, and they fit pretty well. You can actually call and get any measurement you want if you're unsure of a purchase.
Tried the MT v-neck sweaters, but I find those a big baggy...little disappointed as i was happy with the price point. If anyone else can recommend a fairly cheap MT sweater I'd be thrilled.
Was wondering if anyone could comment on the LandsEnd Medium Tall sport shirts. I'm looking for some to wear casually (untucked, I'm a student so I'm not tucking my shirt in regularly), and don't mind getting the torso slimmed if needed. If there are any other recommendations that would be great.
Finally, in regards to sweaters, I have this one from Le Chateau that a friend gifted me. It's a size L, and fits almost exactly like the Lands'End one, except it is trimmer at the waist! Something to think about.
Land End (and LLBean) Medium Tall sizing works well for me, after I take the shirts to a tailor to have the body (chest) trimmed up.
My first MTM jacket was a Samuelsohn. I really like the brand, since it hits a sweet spot in quality for price (i.e. Sammy makes probably the least expensive canvassed jacket available) and, more importantly for this thread, they have XL (extra-long) sizes available. My MTM jacket was actually made on a 40XL frame.
I find that most sweaters are made with longer sleeves than shirts, so depending on the maker I can wear either a Small or Medium size to fit my body well and the sleeves are still long enough for my 36.5" arms. Before I discovered this, my winter wardrobe consisted of only dress shirts (Lands End MT), flannel shirts (in Tall sizes), and rugby shirts.