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[Aay'han]

Hi All!
I am starting to work on my first armor costume, and I have acquired the items I need for my flight suit and flak vest. I am using a top and bottoms that are 95% cotton and 5% spandex. The flight suit should be dark blue. The top is the right shade, but my leggings are so dark that they almost look black. How can I lighten the color and/or dye it the right shade without damaging the fabric? Any help would be much appreciated!