- Oh, no, you see, everybody in my family wears the same costume for their first appearance on the stage.
- Rompers?
- No, diapers.

11 seconds sound clip from the Christmas in July (1944) classic radio play.

You can hear this line at 00:55:14 in the radio play.

Quote context

[...]

- Oh, then you were here before Mr. DeMille, huh?

- No, the Indians were working in one of DeMille's pictures.

- I was a youngster of thirty-five or so.

- How old were you when you started in pictures Linda?

- Oh, fifteen.

- Lionel probably started on the stage about the same age, huh?

- Oh, no, you see, everybody in my family wears the same costume for their first appearance on the stage.

- Rompers?

- No, diapers.

- I'd go to see you in diapers myself.

- Incidentally, did Mr. DeMille leave word about next week's play?

- He'll be back himself, Dick.

- And the play will be, 'It Happened Tomorrow.'

[...]