Ivan, meet redeyedtreefr0g. It's amazing--people who sew can actually make garments in any size they want!

Don't know if she's taking on custom work, but you should find someone who sews. I hear Etsy has people who will do custom clothing. My wife also sews; although I am rather average in size it's still nice to have relatively inexpensive, well fitting garments such as merino wool t-shirts and bike shorts.