From someone who's had severe PCOS all my life which has much of the same body impacts as peri including hot sweats etc:
Get measured for bras twice in the same month: once when your boobs are massive and once when they chill the fuck out. Buy 2 big boob bras and 5 small boob bras and rotate as/ when needed. The difference in mine is 3 cup sizes.
Bin all your shapewear immediately, if you're wearing the right clothes you don't need it. Shapewear will make you hot and uncomfortable and is designed to torture us.
For the newly apple shaped: A-line everything. Midi length a-line skirts worn under the boob with a cinching belt and a top that has puffy shoulders will give you back an hourglass. Mad colours or patterns on the skirt with plain black or white on the top will always look stylish and put together. Equally, a jumper tucked into the skirt at the front and left out at the back will work too. Also a line skirts will breathe and stop you feeling too hot.
Wrap dresses will fit on the bust if you're wearing the right bra, invest in safety pins because they're often low cut, but it's worth it.
Snag tights - fit beautifully and they breathe, you'll feel much less hot.
For facial hair: keep a pair of tweezers in your car. You'll get the random hairs that bother you while you're stuck in traffic etc and it helps keep on top of it.
If you're struggling with BO - use bar soaps and roll on deodorant, never gels and sprays.