Here is a few fabrics all together in one spot ands same indoor lighting with and without Flash.
Underneath is a Frontenac CADPAT ARID Pants 50/50 cotton/nylon
Left is s RAP4 Combat Shirt sleeves in CADPAT 65/35 Polyester/cotton
Top is a Frontenac CADPAT combat top shirt 50/50 cotton/nylon
Middle is Issued Pants brand new made in 2005 I think from the tag, covered buttons on back and cargo and front pockets are Velcro close these are 50/50 cotton/nylon
Right in no name aftermarket specials in M65 us cut pants used as hiking pants one season 65/50 Polyester/cotton
I think the Frontenac which is out of business and RAP4 are fairly close in color. Also the Frontenac uses the same type of material 50/50 I'm not going to get into the its not ir treated etc.
Enjoy, I would like your comments on what you think looks better.