I don't think there would be a "Lavi pattern", but you may want to look for a pattern that resembles his jacket and modify the pattern - a pattern for that would be fairly easy to find. Go into your local fabric store and look through their pattern books, or show the reference pictures to a staff member, they'll be able to help you out!
Sera Myu Eternal Sailor Moon - Sera Myu Musicals - 95%
Mew Berry (CafÚ version) - Tokyo Mew Mew ┴ la Mode
Usagi Tsukino (School Uniform) - Sailor Moon
Sailor Cosmos - Sailor Moon Sailor Stars
Bubbles - Powerpuff Girls Z