Halloween Dilema

We have ourselves a little problem.  Nolan's first Halloween is coming up and we cannot think of what costumes to get.  I (Nick) would like to have a theme with the three of us.  Of course with Nolan being a boy we have thought of Barney, Pebbles and Bam Bam.  I have thought of a scarecrow family.  One of the issues we have been having is that baby costumes look so hot.  I know parts of the country are cold around Halloween but it is probably going to be in the 80s or even 90s here in Mesa.  Nolan is probably not going to need a thick costume.  I'm sure we will think of something perusing the Internet for ideas.