Buy the Laa Laa costume
The Teletubbies Laa Laa costume includes a one-piece yellow green body suit with an open face so you can talk and drink.
The Laa Laa costume also features separate yellow shoe covers which are worn over your regular shoes to craft the look of having Teletubbies feet.
The Laa Laa costume also comes with a headpiece matching the rest of the costume and comes with the face cut out so you can see without vision being impeded.
Finishing touch is the set of Laa Laa Teletubbies costume paws.
You can read more about the Laa Laa costume here