If I was going to recreate the plaid, I'd go with sewing. Paint can be difficult to control [Depending on the line thickness], and doesn't have the same look or feel as something sewn on.
Next con: Nekocon
What I'm working on:
(New-Maybe) Maki Nishikino (Little Devil) - Love Live!
(New) Cure Chocolat - PreCure A La Mode
Luna - Sailor Moon
Junko Enoshima - Danganronpa
Midori Takamine (Painter) - Ensemble Stars