"I have long been designing to speak to my sisters and tell them that, from what the Lord has been pleased to show me from time to time, there is a great fault among them. They are not careful to abstain from all appearance of evil. They are not all circumspect in their deportment, as becometh women professing godliness. Their words are not as select and well chosen as those of women who have received the grace of God should be. They are too familiar with their brethren. They linger around them, incline toward them, and seem to choose their society. They are highly gratified with their attention. 2T 455.1"
"Abstain from all appearance of evil."
The EGW passage directly quotes and applies the principle of abstaining from all appearance of evil in the context of women's behavior.