I've dyed lab coats before. It's not too hard. Most take RIT dye well. That would be my suggestion. Get one that's made of cotton and dye it green.
Cons 2014 - Ahn!Con | Kawa Kon | Wizard World St. Louis | Costume-Con | Marcon | Cosplacon | Dragon*Con | Archon | Chicago TARDIS
In Progress- Cecil from Welcome to Night Vale
| Jonathan Strange from Jonathan Strange & Mr Norrell
| Madeline Westen from Burn Notice
Misha's Costumes in Progress- Mr Norrell from Jonathan Strange & Mr Norrell
Kawa Kon: Into Darkness in 2014!