I dress modestly and wear long (knee to floor length) dresses or skirts to Sunday liturgy. I usually cover my arms (I have ugly tattoos on right arm) but rarely will wear 3/4 sleeves. I'm not always very formally dressed though. Last Sunday I wore my teva sandals with a long skirt. I sometimes walk the three miles home since I don't have a car. I don't think God minds. Modesty and humility seem more important to me than being dolled up but sometimes I do that too.
At weekday services I wear jeans sometimes, especially if I'm rushing in from housework or regular work. I'd prefer not to but in a pinch I'd rather just get to church. My non church attire is generally pretty modest anyway.