Nick Knight’s website, ShowStudio, has an archive of downloadable patterns from notable designers that you can print out at home. There are garments from Anthony Price, Yohji Yamamoto, Junya Watanabe, John Galliano and others. There are never instructions, but there is a visual reference in the form of a finished product. Some of the garments are very complicated, but half the fun of learning is working through the challenges.
There is a new pattern up now for a Giles Deacon dress: HERE
They are also running a contest of sorts to see if your dress can be in a fashion film on the site. It sounds like an interesting challenge.