I'm inviting you to write about your favorite costume drama.

I'm using the term "drama" loosely. The film(s) you choose to write about can also be comedies, musicals, etc., if you like.

I would prefer "costume" to not be synonymous with "period" drama. I know many people think of movies set in the 1980s as "period" films. Anything set early 20th Century and before is fine. (Let's use 1920 as a completely arbitrary marking point.)

So any movie set 1920 and earlier is acceptable and can be set in any area of the world. The movie can have been made in any era, from any area of the world.