Umm. . . I'm not sure what the 'tattered thing' you're talking about is.
The front panel that I've also roughed out in purple... It looks like... well... I'm not sure. Nothing I've ever seen on a Victorian dress. Only thing I can think was there was a front panel and she shredded it. Maybe it was the cat's fault.
Ah. . . I actually thought that was part of her petticoats, or at least one of the outer layers. So, sorry, not a clue here. Though I like the colour triangle you've got in that area, with the contrasting green and purple, and neutral cream.
But the bit at the back is a bustle. And when you're dealing with anyone who insists on petticoats being slit to the hip, you might as well just make it it up as you go along. . . .
It's a lot smaller than the bustles I'm used to seeing. And you're right about the petticoats! My husband talks about Steampunk gentlemen's magazines showing full frontal ankle.... and you can see her entire limb! 
Mm, bustles grew and shrank several times as shilouettes changed. That one looks more Edwardian than Victorian, especially with the hip panniers (And as all the bustles of that pattern I've seen were supposed to be worn
under a skirt, we're back in 'any way you want' territory. . . .)
I'm really impressed by the modelling on the cat's goggles, embarrasingly, I'd have probably cheated and cut a pair of thin sections of tube.
Thanks! If I could have found a tube tiny enough that I wouldn't crush by trying to cut, I might have... those goggles are REALLY itty bitty. Hrm. Maybe a tube the right size, filled with green stuff, let harden and THEN cut might work. Something to remember next time.
More than one person has told me that if you can get rod of the right diameter, and insert it before cutting it can save a lot of potential grief (this assumes you're rolling the tube and it's supporting rod under the blade rather than trying to cut straight through) But thus far I've just cut the tube by rolling, and taken it slowly, and I've yet to have any any trouble.
- I know. Famous last words. . . .
Obtaining the tube in the first place though, I can see that might be a problem. I'm lucky in that there's an engineering supplier in town which will supply brass, steel or aluminium tube down to .75mm diameter.
So yes, impressed with your diving in with the green stuff.
"Gott weiß ich will kein Engel sein. . ."