It ain't fittin', it just ain't fittin'. It ain't fittin'.
6 seconds sound clip from the Gone with the Wind (1939) movie soundboard.
You can hear this line at 03:08:39 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.
- Melly'd be so disappointed if you weren't surprised.
[...]

 Dead of Night (1945)
 Dead of Night (1945)  Phantom of the Opera (1943)
 Phantom of the Opera (1943)  Scooby-Doo, Where Are You! (1969)
 Scooby-Doo, Where Are You! (1969)  Halloween III: Season of the Witch (1982)
 Halloween III: Season of the Witch (1982)  Knight Rider (1982)
 Knight Rider (1982)