There's a picture of Rainesy and Joel in the yellow shorts on the RFC website.
The first instance of Richmond wearing yellow shorts can be traced back to May 24, 1975 – co-incidentally against North Melbourne, at Arden Street.
The Richmond team that donned the yellow shorts for the first time, in Round 8 of the 1975 season, was (in alphabetical order): Gareth Andrews, Neil Balme, Kevin Bartlett, Francis Bourke, Dick Clay, David Cloke, Daryl Cumming, Merv Keane, Robert Lamb, Eric Leech, Craig McKellar, Kevin Morris, Billy Nettlefold, John Pitura, Neville Roberts, Kevin Sheedy, Paul Sproule, Ian Stewart, Steve Taubert, Bryan Wood.
The quarter-by-quarter match details were:
Richmond: 1.4 5.9 8.9 9.12 (66)
North Melb: 2.2 3.2 7.5 11.8 (74)
http://richmondfc.com.au/Season2007/News/NewsArticle/tabid/6301/Default.aspx?newsId=46639