Can someone help date Dallas Cowboys pants by Red Fox?

[BrianK]

Thanks for the replies. My research also showed that the pants changed in 1974. (Bluer and different details.) But I wasn't sure when the style started. If it's 1971-1973 based on the color, I'm happy with that. The player would be Calvin Hill. Slats7 found my purchase in ebay's sold items. Maybe one day I can photomatch the repair on the right leg.

I'm having a hard time finding solid information about the manufacturers of Cowboy pants. I found a page at Mears that says Southland made the jerseys and pants in 1960. Red Fox took over the pants in 1961. Then at some point it was Sand Knit. But I don't know the dates.