[Illustrator] Troubles with down-scaling strokes

Hey

I'm making some t-shirt prints and I want to put my print on a t-shirt template n illustrator, but I'm having troubles with the strokes. They won't scale down, i'm guessing that the fact that they are 1 px strokes makes the "unscalable"?

What I mean is, when i scale down the print to 50% the strokes still have a "width" of 1px, but the height of 0,5 px, is there a way to solve this problem wihtout having to re-do the strokes?

Thanks,
Jake