What you should try and stick to:

2 Nude Bras

1 White Bra

2 Black Bras

your special occasion bra or set.

underwear is easy to pack into a small space so dont worry about how many you have.

socks get rid of all those extra fuzzy socks that are not soft anymore its okay to throw them away.

Remember, anything you do not use very frequently- get rid of. post it on apps like Curtsy (and yes even bras get bought) but maybe dont sell your underwear or socks - throw those ones that have holes out.