Hello,
I get this in digest form so I apologize if anything I say is repetitive of 
something someone has already posted.  There is a pattern for a similar blouse 
in 1906 in the Delineator: 
https://books.google.com/books?id=tGxJAQAAMAAJ&lpg=PA1177&ots=D7FhGj19hw&dq=The%20Delineator%2C%20June%201906&pg=PA646#v=onepage&q=shirtwaist&f=false
The reason it might have the overbelt and not be permanently gathered in the 
front is shown in a book from 1911:  

http://chestofbooks.com/crafts/needlework/Text-Book-On-Domestic-Art/Shirt-Waist.html#.Vc-L2rTy8y5
Basically, it was because it was much easier to launder for the students in the 
era before washing machines.  :-)   You can use the inner belt to keep the 
shirtwaist from moving around and the outer belt is used to keep the 
pleats/gathers in place while you are wearing it.   The outer belt would be 
hidden by the skirt and yet another belt.
Hope that helps!
Sincerely,Isabellahttp://www.extantgowns.com                                    
  
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