following the curves

i'm putting a design on a jersey, of course if it is a jersey therefore it has curves or some ups and downs or some waves...whatever u called that. I want my design to follow the waves of the jersey how can i do that?

Can you get a photo of the jersey to use as a reference?

here's the jersey

Are you talking about the neck/arm holes, or those purple stripe things?

i was referring to the abdominal part of the jersey, what if i want to add another pink strip there, as you can see the abdominal part has these curves and waves

Ok. You've got a couple options depending on how you're wanting to use the curve.

You can make a selection of the curve, using quickmask or channel operations, then move the selection somewhere else and fill/edge/whatever using it.

The other option is to use Photoshop's bezier path tools to match the curve, then move the path around to where you need the reference.

I'm assuming you're using Photoshop here. If not, the GIMP has these same features.