Actually "plume" refers to what they used to write with in old ages. But it can also mean the writing abilities, depending on context.

...revue, film

expression complète "la plume de ma tante est sur le bureau de mon oncle" from an old sentence to learn french (literally: the pen of my aunt is on the desk of my uncle)

In French we say la plume to express the writing skill or style of a person

"La plume de ma tante" is a meaningless English phrase used to suggest that the speaker knows French (but doesn't really mean to be serious !). The equivalent expression used by the French is "My tailor is rich".

--------------------------------------------------
Note added at 13 hrs 15 mins (2004-10-05 05:19:34 GMT)
--------------------------------------------------

The French expression has been referred to in the advertising campaign of a car manufacturer (who shall remain anonymous) that has been running, I think, from 1970 and is still going strong: \"My Toyota is fantastic\".

it depends.plume can refer to a pen or a feather,it depends on the context