▁j er sey ▁( former ly ▁the ▁de ▁fact o ▁third ▁j er sey ) ▁and ▁the ▁annual ▁" City " ▁and ▁" E arn ed " ▁j er se ys . ▁ ▁Canadian ▁football ▁ ▁The ▁Canadian ▁Football ▁League ▁first ▁introduced ▁the ▁use ▁of ▁a ▁permanent ▁third ▁j er sey ▁on ▁September ▁ 6 , ▁ 1 9 9 4 ▁when ▁the ▁Cal g ary ▁St amp ed ers ▁wore ▁black ▁uniform s ▁for ▁the ▁Labour ▁Day ▁Classic ▁against ▁the ▁Ed mont on ▁E skim os . ▁The ▁C FL ▁did ▁not ▁have ▁a ▁rule ▁for ▁use ▁of ▁alternate ▁uniform s ▁and ▁teams ▁were ▁able ▁to ▁wear ▁them ▁as ▁often ▁or ▁as ▁little ▁as ▁they ▁liked , ▁a ▁rule ▁that ▁is ▁still ▁in ▁effect ▁today . ▁Teams ▁are ▁also ▁able ▁to ▁wear ▁multiple ▁alternate ▁j er se ys ▁within ▁the ▁same ▁season , ▁as ▁seen ▁with ▁the ▁Montreal ▁Al ou ettes ▁during ▁their ▁ 2 0 0 9 ▁campaign ▁when ▁they ▁wore ▁alternate ▁black , ▁blue , ▁and ▁throw back ▁j er se ys , ▁in ▁addition ▁to ▁their ▁regular ▁home ▁and ▁away ▁uniform s . ▁Teams ▁are ▁also ▁permitted ▁to ▁wear ▁their ▁third ▁j er se ys ▁as ▁the ▁away ▁team , ▁provided ▁that ▁they ▁do ▁not ▁cl ash ▁with ▁the ▁home ▁team ' s ▁uniform s . ▁Despite ▁teams ▁having ▁no ▁restrictions ▁with ▁third ▁j er se ys , ▁only ▁the ▁St amp ed ers ▁chose ▁to ▁wear ▁them ▁during ▁the ▁ 1 9 9 0 s , ▁pres umably