Downton Abbey star Michelle Dockery has donated a dress to an auction house to raise money for Oxfam.

A red Prada halterneck dress, worn by the actress at the 2013 Emmy Awards, will go on sale at Christie's auction house's Pop Culture collection in London on 20 June (14).

Dockery hopes the frock will raise money to help Oxfam give aid to refugees of the Syrian civil war.

She says she hopes the buyer "will get as much pleasure from it as I did when I wore it to the Emmy awards and that we can raise as much money as possible to support the Syrian people".

The dress is expected to attract bids of up to $8,000 when it goes under the hammer.