Anastasia Steele: I have some issues with the paperwork.

Christian Grey: I’d be disappointed if you didn’t. Shall we discuss over dinner? Tonight?

Anastasia Steele: As this is a contract, I’d like a business meeting.

Christian Grey: Fine. I’ll wear a suit.

Anastasia Steele: I’ll be wearing a burlap sack.

From the movie Fifty Shades of Grey (2015)

“I’ll be wearing a burlap sack.” – Quote meaning

As they’re suppose to be discussing their “relationship” contract, Ana doesn’t want Christian to be distracted by anything that she’ll be wearing. She wants to be taken seriously, so she jokingly says she’ll be wearing burlap sack as to not appear sexy. Christian will be forced to focus on what she has to say, not what she looks like.