Those 70s era jerseys are the perfect illustration on why they ISU fandom will never really come to agreement on what our jerseys should look like. Since the post-war era, Iowa State has had basically a different look every 5 to 10 years, and every look seems to have its proponents and detractors, usually driven by nostalgia.
For those that don't have strong nostalgic ties to any particular look, its easy to default to what ISU wore when the teams were successful in hopes to bring back that past success. The kicker there is we don't have much as far as a golden age of ISU football to call back to: the best eras being the Earle Bruce years, and now (the Campbell years).
To me, the Bruce-era jerseys are a mess with the 4 shades of gold and 3(?) shades of cardinal. I feel like some of the flaws of those jerseys are hidden by the fact that pictures from that era all seem to have a red/orange tint to them. But the "Beat Iowa" throwbacks from 2007 really show how haphazard the look is.
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Ooof, that photo powerfully supports your point. Lighting?