If I measured it right, my copy of ISABOA's Sinister Dexter shirt is about this size, so it looks like it fills most of a girly shirt but not all of a guys shirt.
I think you're good, I submitted this one and than changed the tamplet and I just got mail from Rachel that it's acceptable for the contest and I think your design is smaller so there shouldn't be any problem.
Sweet stuff, I kinda wished the butterfly stood out more, like to accentuate the life in this a bit more. I know plants are alive, but nothing says life more than a moving, fluttering, colorful being.