You are definitely on the right track here. St. Paul wrote about not causing our brother to stumble. I've often wondered how any man can concentrate on worship and focus on the Eucharist when a woman two pews in front of him is wearing clothing too tight/too revealing/too...whatever. There are certainly ways to look fashionable, not dowdy, without giving our brother cause to revisit the confessional before he can receive Eucharist!
Thank you for giving the account of the Blessed Mother's message as well. She is certainly our model for decency and purity!
As a side question, can you explain what a scapular is, and what it is for? I have seen them, but am not sure what the purpose of them is?