Here are some ideas for you....Most of these are antique dresses.  Others are antique reproductions.  I have not made any of these dresses, but just show them here for additional ideas for you.  I can make any of them (or something very similar, depending on materials), using custom measurements from your doll.

 

#1   #2   #3   #4   #5   #6
                     
         
#7   #8   #9   #10   #11   #12
                     
         
#13   #14   #15   #16   #17   #18
                     
             
    #19   #20   #22   #23    
                     
             
    #24   #25   #26   #27