I still miss the green touches in Robin's costume, but you make a good point for what the Red Robin costume represents to the character at this point. It's kind of neat that we can actually do that with these characters and have it mean something to the character, not just be a lame marketing thing (Superman has a new logo! Instead of yellow, it's black! Like the KINGDOM COME logo, get it??).
Something that could share traits with his two Daddies would definitely be ideal for Conner at this point.