Dillard's big and tall
Macy's , big and tall - Levi's
deluth trading company
JCp.com. The non wrinkle flat front khakis are 34 x 38 online only and they even have some hem to let out if you need more.
BUCKLE is great for jeans because they can also order but have several 37.5 lengths in store. Give them a shot for jeans. I know they are expensive but they fit wonderfully.
SALDLY athletic pants are the hardest - Adidas tall have the longest inseam. Nike's tall ones are a JOKE
for shoes: www.oddball.com