The red and blue colour scheme is seen as a little too close to that of the Habs, and union president Bob Kinnear says TTC operators don't want to wear uniforms that remind them of the Toronto Maple Leafs' arch rivals.
"They just don't look good to begin with but the fact that they do reflect the Montreal Canadiens colour scheme has been very dissatisfying to our members here in Toronto," Kinnear told CBC's Daybreak Montreal.
The TTC is bringing in new uniforms next year with several options being considered.
Kinnear says he believes if the uniforms are imposed, his members will boycott the proposed red and blue striped golf shirts.
He says the TTC has not confirmed it is moving forward with this colour scheme and is confident the uniforms will be redesigned.
"I think considering the overwhelming response from the employees, there's going to be some reconsidering," said Kinnear.
The TTC's current uniforms are grey slacks with a light blue shirt.
Kinnear defended the Maple Leafs' last playoff defeat in game 7 against the Boston Bruins, saying his TTC union members will support the home team regardless of past performances.
"We're in a rebuilding process and we in Toronto like to look forward. We like to think about the future and move forward," he said.