Ah I can see it now thank you!
Well there are quite a few ways to accentuate the background flag, I'm sure there are many experienced modelers here who could tell you multiple ways of getting the results you desire.
But if I were to do this I would probably look at drawing closed vectors to represent every other stripe (see image as example) and then with these vectors I would use the Create Shape
modeling tool and use an angled profile
and limit the height
, that way you create a bold border from the angle yet the shape is still flat, and set that to subtract. An example of the kind of shape i'm referring to is demo'd in this video I did a few years ago:http://support.vectric.com/tutorials/V8/ModelingaCartoon/ModelingaCartoon_2.html
watch it at around 39.00. This should help you accentuate the stripes in the flag! alternatively you could just use a flat profile set to subtract too. Another option would be too look at sculpting into the flag (using the sculpting tool) and using a method where you subtract to accentuate the stripe line and then smooth and smudge back into it to create a smooth transition.
I hope this helps!