A friend of mine is trying to figure out what character is this girl's halloween costume. It's an old picture from approximately 1987. The mask is a white face with pink cheeks, it looks like purple or possibly blue hair. There is a pink bow in the hair, and antennae with blue balls. The plastic "costume" is blue, with a picture of the character on it, but the girl is turned in such a way you cannot read it. The character appears to have blue boots. The colors are all pastel. It is not the Wuzzles or the Popples.

Can you post a photo on here using the advanced setting to attach a file ?

Trying to think what would be popular in '87 (are you sure about the year?), and fit your description - possibly a Rainbow Brite character. ( although '87 might be a little late for that... ) there are little creatures called Sprites from the show, they do have one that is blue, with antennae and a bow, check out the link, it shows an advertisement with the characters, the Sprite in the front is the one I'm guessing. Is this is?

Rainbow Brite - Twink and the Sprites Paperback - RainbowBrite.net