Shoes: I wear my Doc Martens. I have 3 pairs that I rotate through so they have time to breathe and reduce foot funk. Each pair has gel inserts (Dr Scholl's I think?).
Scrubs: I swear by my dickies for bottoms and tops. I've tried various brands, these are the ones I like best.
Stethoscope: I haven't needed more than the disposable ones on the unit in 5 years of behavioral health. Been in the ER for 6 months, think I've needed a good stethoscope 3 times (2 asthmatics, 3rd time for bowel sounds on an obstruction).
Edit: clarified statement to reflect needing more than disposable stethoscope