"Dolly is derived from a mammary gland cell and we couldn't think of a more impressive pair of glands than Dolly Parton's."
https://en.wikipedia.org/wiki/Dolly_(sheep)
In the end I think her generosity outshone her other famous attributes.
“I make jokes about it, but it's the truth that I kind of patterned my look after the town tramp. I didn't know what she was, just this woman who was blond and piled her hair up, wore high heels and tight skirts, and, boy, she was the prettiest thing I'd ever seen. Momma used to say, "Aw, she's just trash," and I thought, That's what I want to be when I grow up. Trash.”
and:
"It costs a lot of money to look this cheap"
Nowadays we may be extremely sensitive about that sort of thing (increasingly on behalf of others, unsolicited), but at the time it was not mean spirited or wildly offensive.
That's what "the past is a foreign country" is meant to communicate.
"and some say she's just a big pair of tits"