From Gilbert Chase, "America's Music":

...The basic symbol of sociocultural mobility in the genteel tradition is probably that of the "Grecian Bend"—an extraordinary fad, which flourished circa 1858-1869. It became indeed a national craze...a fashionable female with a minuscule parasol, high-heeled gaiters, and a prominent bustle.

He quotes a line from a work song...

"I'm goin' to ship on the Eagle Tender,
Buy my wife a Grecian bender."

He quotes other popular songs of the times...

"Girls can't get drunk, nor fight the tiger like men,
They at the club can't meet a friend,
Can't bet on horses, nor can they play base ball,
So let them sport their Grecian Bend."

OR...

"Miss Dinah Snow," of sable hue,
In festive style arrayed,
Came loit'ring down the avenue,
The Grecian she displayed;
Accosting her in sportive mood,
She thus to me appeals,
"I carry sir, the 'Grecian Bend'
To balancy my heels."

Yes, the Grecian Bend was a BIG BUSTLE! I haven't searched through the sheet music sites on our links page, but if you're ambitious enough to go look see, I'm staring at a photocopy of a sheet music cover called ...taa daa...

"The Grecian Bend"
Words, Martin Beyer.
Music, John Molter,
Published by Molter & Wurlitzer. 1868.

Tellin' ya, baby got back. Frank i.t.s.