Thanks for all the input!
It's good to know that the apron is basically a bunch of rectangles. The shoulder straps, while the above illustrations don't show it, cross once at the back and the ends are sewn diagonally into the waistband ties. It's really simple but hard to explain.
I don't know which I'll do for the cap, whether starching or interfacing - but I probably won't start this whole project for a few months, yet, so there's no rush. I'm leaning toward starching (even for something not 100% historically correct, I like to consider period techniques. I can be really OCD sometimes).
I forgot to mention that the bodice and skirt are illustrated in the book as being an actual dress - sewn together with no outer waistband. That would be a bit advanced for me, so I think I'll just make the bodice and skirt separately (the apron would hide the construction). Also, I'd get a bit more freedom in fabric type choices - instead of completely using black twill, I could use a more lightweight fabric for the bodice.
Since the bodice ends where the skirt begins, I think I could get away with using TV491, with View 1 sleeves from TV495. Oh - I know that Victorian sleeves were more movement-restricting than today's sleeves. Would that would have stayed true on a servant's dress, especially a maid of all work, who would have been cleaning for much of the day?
valleyviolet, I actually am making this to wear to an anime convention in October next year! So I will take shortcuts when I need to, and the aformentioned TV491 would be fine. Seeing that apron of yours was a good help; I can see how the skirt affects the way those folds drape. Isn't safety pinning the apron "bib" to the bodice a period technique?
I better get to bed; I've been ill for the past week and need my rest (ignoring the fact that it's already 2:30 in the morning).