Wolford is often strongly recommended here. I have two questions: how does the sizing work? Based on weight and height? Should I go a size up to avoid rolling down and muffin top? Also, I want a pair of black hose, not an opaque tights. I do not want super sheer. Should I go with 50 denier or 20 denier. I understand that 10 denier is super sheer. I cannot go to the store in Tysons. I need to order online( Amazon sells wolford), and hence my questions. TIA.