I have a friend on another (dachshund) list who will custom make anything you want (she even made pilgrim outfits for Thanksgiving one year) for any size or shape dog. She does great work and has reasonable prices. Check her out. She knows all about long bodies with her dachshunds. That's what got her started.
Her name is Rhonda.
http://www.dachshundsdressedforshow.com/