Ideas to make a Pokemon costume?

I want to make a flaaffy costume and an eevee costume.
Also a buneary and flareon costume. So here are my ideas:

i want to get one of those footy pajamas with the hoody.
Where can I get those?
and not to expensive. a reasonable price.

Also, What could I use to make the ears for each costume,
and tails, ext.

any stores that coul help out?
where could i get one?

If you think $65 is reasonable(it is, considering…) then you should look into buying a kigurumi. i love them. i have a pikachu kigurumi