Everyone loved this idea and so I have started another costume.
So here are the parts for her costume:
The Trench - I already drafted an un-tested Iverness so I need to omit the cape and draft sleeves (uuuugh, hate sleeves) and figure out the lapel situation. I know shades vary but I think a bright red would be good to be more eye-catching, but I don't want it to get too McDonalds-y.
I'm thinking a Red Gab, it'll be lightweight enough to not bother Olive but enough structure for the trench.
The Shirt- I'll throw together a yellow dickie so Olive's not wearing too many layers. Maybe make a cowl neck or something
I'll go cheap and use lemon broadcloth. I could make a slinkie/sleazy-type-thing out a knit but I'm not sure I want to do that or not.
The Hat- I'm not how dramatic to make it. Olive's great about hats, as along as she can see, she's good. If I had my way it'd be HUUUGE- let red hat society huge.
I made a quick sketch of what I was thinking but it just looked like puppy as a farmer, I hope that's not an indication of how this is going to go.