Dolly's tits have been through so many changes through her career alone, there's definitely a timeline there.
1967-1976 low key slim & stacked
1976-1979 growing year to year-Carson starts joking about 'em, literally busts out of her dress at the 78 CMA's (pic).
1980-1985 peak peaks-Full blown brickhouse Dolly hits Hollywood grows to her heaviest, biggest tits in the world where the mainstream is concerned. 9-5, Whorehouse, Rhinestone are practically soft core flicks. Dolly takes a sabbatical for health reasons.
1987-1990 Dolly's big comeback on ABC, dramatic weight loss & possible reduction. Boob jokes dont make sense now. First implants.
1990-Now several implant revisions. IMO she looked her best in Frank McKlusky CI in 2002 (dont watch any scene hes not in lol).
Also peep the 1996 Christmas flick Unlikely Angel where she's packed into the sluttiest outfits ever seen in a family flick.