Will there even be a corset big enough for Juliana or will some makeshift device have to do? I assume they make them for post—WLS types who are still huge, but am not sure.
Post-op mastectomy binders aren't much different in function from pre-op FtM or gyno binders, so if J has anything lying around from previous attempts at binding, now's the time to dust it off.
Surgical centers are not the best at providing post-op compression gear. Semi-off-topic advice to anyone planning surgery: buy at least one extra binder/corset/support product on your own dime
(Amazon, eBay, etc; not difficult and much less expensive than with insurance) so you can wash it and dry it while wearing the other one.
She definitely could Velcro two of the standard mastectomy binders end-to-end, bitching the whole time that they come in floral patterns.
Natalie Stewart had drains for a bit when she got her itty-bitties lopped off. I can't imagine Juliana not having drains.
Dr. Gallager brags about her"no-drain" procedures, but IIRC her super-secret method is just tacking down tissue with a lot of additional sutures, to prevent seroma forming by stitching closed the places where seroma
could form. Drains prevent seroma by sumping out fluid so it can't accumulate. Binders work by also pressing tissue together, but from outside.
I've never performed surgery but I've repaired clothing that's ripped at a seam. If I were tasked with putting J's chest back together so it stuck, I would use every single tool I had at my disposal.
If J were a pair of jeans, that'd be an extra layer of ladder stitch using dental tape. For a human chest, maybe sutures, Prevena, binder and drains. I'm still concerned about her getting out of bed, and up from a chair. I don't know a lot about California Air B&Bs, though; maybe there are a lot of accessible ones up for rent in the vicinity of big surgical centers! I'm sure it'll all be fine.