Well, I don't think it's fittin', but...
5 seconds sound clip from the Gone with the Wind (1939) movie soundboard.
You can hear this line at 03:08:34 in the Blu-ray version of the movie.
Quote context
[...]
- All right Mammy. I'll teach her to ride side-saddle.
- And I'll buy her a blue velvet riding habit. She'll love that.
- A nice black broadcloth is what little girls wear.
- Oh, now, Mammy, be reasonable.
- Well, I don't think it's fittin', but...
- It ain't fittin', it just ain't fittin'. It ain't fittin'.
- What are you doing downtown at this time of day?
- Why aren't you helping Melly to get ready for my surprise birthday party?
- Why, you aren't supposed to know anything about that.
[...]