Braceface

'Braceface' is an animated television series co-produced by Canada, America and China, and aired from 2001 to 2004 for three seasons and 78 episodes. The cartoon looks at the life of Sharon Spitz, a teenager in Elkford, British Columbia, whose braces prove to be a problem for her in trying to be normal in high school.

S3E6: Busted
When Sharon is mistaken for being younger, she uses a pump bra to change that winds up losing control of it during a party.