Holly - I guess it's no different to 'professional' men wearing trousers, rather than shorts in a business context though. Must admit, I go for hold-ups when it's really warm but I'd rarely do bare legs.
Delighted for you Hesney. DN has decided when she is a partner in her firm she will decree that tights need not be worn. Though Kate Middleton, unfortunately, succumed to the nude tights diktat. Agh!!!