Outside of church:
St. John of S&SF disliked make-up on women. He would hand the ladies a handkerchief to wipe off lipstick before communing them. Likewise, women wearing lipstick should not kiss icons.
The Bible tells us that men and women should have their own distinctive way of dressing. Women should not wear men's clothing and vice versa. No rules exist (that I know of) for these modern times, concerning such things as "slack suits" made especially for women, but women should wear skirts anyway, in church. Some Orthodox women wear skirts all the time, inside and outside of Church; and if they need slacks for warmth, they wear them under their skirt.
One matushka I know always also wears a head covering even in public. Women like to carry a scarf in their purse or glove compartment in case an unexpected opportunity arises to enter a church or to pray with other Orthodox. Pious women cover their heads for their prayers at home at their prayer corners.