After you complete all of the tasks in Donald's Dreamland, when you go to a HQ to get a new task, you will only have one option - to visit Professor Flake (Polar Place in the Brrrh) to get your lawbot suit parts. He will then have you retrieve an "External Temperature Sensor" from the cogs on every street in toontown (except the brrrh). You have to do these tasks one at a time for a total of 14 lawbot suit parts. (Honestly, though, it doesn't take but an hour or so to complete)
Once you have completed your lawbot suit, you will then go back to toon HQ to get a new toontask. The only one available to you will be to visit Shep Ahoy (All for Nautical - Seaweed Street - Donald's Dock) to get your Bossbot suit parts. To get these parts you will have to defeat one of each of the bossbot cogs (from Flunky to Big Cheese) and then you will have to defeat a series of Version 2.0 cogs (which can only be found in the cog golf courses). For your very last part, you will have to visit Flippy at toon hall in toontown central. He will give you your 17th bossbot suit part, and then you will have all of your suits complete!! (It took me a day to finish my Bossbot suit...)
Good LUCK!
