Peru Dress What Is The Dress Code In Peru?

What is the dress code in Peru? - peru dress

Hello,
I wonder if someone traveled to Peru and had some suggestions on what to pack - I will offer in May and I have no influence on everyone.
Is there a dress code to enter the church or go to the market, or visit the ruins? (ie up to the shoulders, trousers or skirts are required).

Thank you a bunch