StarWars.com:
Reflecting the origins of Darth Vader's design, Japan's
Yoshitoku Company has created a
1:4 scale "Samurai Vader" costume for "Boy's Day" festival celebrations in Japan. The costume, which will also include a traditional bow and sword, will cost about $1500 to $2700, and at time, will only be offered in Japan.
Check out the above link for more information.