One thing I've learned with weathering is when doing Fabrics like a flightsuit or something along those lines is to pre wet (not dripping wet though) the areas you want to have weathered and when you apply paint using a spray bottle and watered down acrylics it helps make the paint bleed and look more realistic. Just make sure your acrylic paints to water is at least 50/50 if not more water. You can always layer colors. And remember that when you wet the fabric it will darken it so when you add the weathering it will look very harsh. And I mean very harsh. But when you dry it it will look good. And best part about that if it's too much paint, throw it in the wash on a regular cycle and then dry it. It will help take some of the paint out making it even softer.