Discussion about turning jerseys into billboards has been going on for years .
It started gaining serious momentum back in 2009 , when the WNBA 's Phoenix Mercury and Los Angeles Sparks reached agreements to promote sponsors on their game uniforms .
Discussion about turning jerseys into billboards has been going on for years , but it started gaining serious momentum back in 2009 , when the WNBA 's Phoenix Mercury and Los Angeles Sparks reached agreements to promote sponsors on their game uniforms .