Baby costume for fancy dress party

[Heaven]

If you look at the lincraft website you can see all the different patterns they have, there's lots of fancy dress ones on there.

[Daydream Believer]

If you can sew, you could sew up a purple suit & make a hat out of felt or something & he can go as the mad hatter

Or you could get some iron on transfer paper & print off hearts & iron them onto a white jumpsuit with red stockings & her could be one of the Heart cards