Bleach gel in a bottle (not a pen) creates a loose drawing, then tighten it up with fabric markers for a fun technique.
Mandarin Duck: Feather T-shirt Design by Mandarin Duck
DIY Jutebeutel mit Pünktchendesign
I already love Sharpie, but this just takes it to the next level. Can't wait to get my hands on these!
DIY Fashion Idea: Watercolored Feather T-Shirt Tutorial - cute craft idea
Fabric Painting: What you need to Start.
rainbowsandunicornscrafts: DIY Kawaii Tee Shirt Tutorial and Templates from Petit à Petit here. This project uses Stained by Sharpie Fabric Markers so it is really easy.
Multi Fine Primary 6pk $6.99
DIY Watercolor Lampshade with Fabric Markers - Mad in Crafts