So this may be a weird question, but how come in dresses like the one's Christine wears, the women's boobs are always popping out? Is this on purpose or just because of how tight the dresses are?
The thing with the female body is that if you put on a corseted bodice of some sorts it will either push everything upwards (pre 1800-corset) or both up and down (19th century corsets). The torso is remarkably shapeable, not necessarily in changing the skeleton, but in rearranging the softer areas. So if you have even hint of curves, you’ll get a solid cleavage in a corseted/boned bodice. The bodice doesn’t necessarily have to be very tight, just squeeze at the right area.
In addition, it’s often amplified in Christine’s costumes with adding pads just under the bust. This is both to push the boobs upwards, and to substitute for a bra, as that is normally not worn under the bodices. This is Samantha Hill’s wedding dress on Broadway:
It’s done to give the wearer a historical silhouette, the hourglass shape.