Green’s Dictionary of Slang

1. a damasked skirt.

1882

C.G. Leland Gypsies 116: From [...] under the bed she raked out [...] an old Dolly Varden or damasked skirt.

2. (US) a male homosexual whose sex of choice is fellatio.

1906

J.R. Parke Human Sexuality 310: These young men, corresponding in many cases very closely to the feminine type [...] are variously know to their patrons and outsiders [...] as ‘tasters’, fruit’, ‘lady-men’, and ‘Dolly Vardens’, whose intercourse is had by orastupration [Simes:DLSS].

3. the garden [rhy. sl.].

1960		J. Franklyn Dict. of Rhy. Sl.
1969		S.T. Kendall Up the Frog 13: I’ve got to take the cock sparrer up the Dolly Varden fer some rosebuds.
1977		D. Powis Signs of Crime 181: Dolly (Varden) Garden: ‘Ted’s in the dolly.’ (Dickens character.).
2002		B. Kirkpatrick Wicked Cockney Rhy. Sl.