The RSVP online is a big improvement.  Along with the response tab, there are additional tabs for the registry, travel arrangements and the couple’s backstory. 

Is it typical for a wedding invitation to offer guidance on proper attire?

FORMAL

The ceremony will take place in a traditional Catholic Church. Please dress appropriately for a church ceremony. Please refrain from wearing the following: anything too revealing or short, jeans, t-shirts or crop tops.

Collared shirts and dresses are appropriate

I get it.  You can’t rely on people to know how to behave.