So I’ve had a dilemma for ages that in winter I have a lot of heavy thick clothes that take ages to dry (wool etc that can’t be tumble dried) plus things ruin quicker from constant washing.
I do like to wash things between wears if they are things that are tight against the armpit, even if I have a t-shirt under they still get a bit sweaty/ deodorant smell as I’m rushing around all day.
I wash twice a day and use Mitchum before anyone says wash more 
Anyway I have just discovered stick on armpit pads - revelation!! Now I can wear jumper dresses etc several times between washes.
Anyone else use them? Can’t believe I’ve only just discovered them!
Realise they are maybe not very environmentally friendly, but no worse than panty liners and I’m using less water / washing detergent as a result