Clean, semi formal, suits & ties not required.
More or less a dressy shirt and nice pants, maybe even dress pants and a dress shirt. Look Professional
I am not a grocery clerk, but if I were applying for a position there, I would wear dress pants, preferable black and a nice top.
Professional clothing. dress shirt/dress pants and/or a skirt and a dress skirt.
A nice dress shirt (white) with black dress pants. That’s the usual attire of the workforce so they’ll think you pay attention.
Work place casual. Not too dressed up, but look presentable.
Something casual to semi formal