Meryl Streep plays Margaret Thatcher in "Iron Lady." Love the 'do.

Never deny the power of big hair.

Margaret Thatcher’s sizable bouffant is reported to be all over the runways of Marc Jacobs and Chanel and now, with the release of “Iron Lady” this winter, this big hair trend is expected to be … well, even bigger.

Intrigued? Check out celebrity hairdresser Marc Woolley’s step-by-step instructions for creating this large-and-in-charge look.

I’m pretty sure that global domination requires an iron fist, large heated rollers and a paddle brush.