OK, we'll start with Fatface as they've just obtained B Corp accreditation.
Standard office wear - 5 dresses, footwear, two cardigans.
Couple reduced to £35, full prices start around the £55-60 mark.
Pair of boots they might be able to get away with - £85.
Cardigans start at £42.
Cost before underwear & tights = £404
Bakujen preloved £57 frock, new around £150+ each.
Onto Vinted, ignoring the dishrags, maybe £30 if you're an 18. Or a 6.
Their knitwear's nice. £80 in sale to £100+. Vulnerable to moth, though, also a common issue with secondhand natural fibres. glares at holes in rug caused by a purchase from Scope
Rapanui, Finisterre, Eileen Fisher and the like aren't selling office appropriate clothing.