1950s Abstract Print Belted Dress, large

1950s belted dress with blue, green, and purple abstract plaid  print. Decorative buttons adorn the full skirt just below the waistline.
Unknown fabric, possibly silk, offers no stretch with buttons down the front for closure.  Comes with matching belt.  
 
In wearable vintage condition with a few imperfections:
-major wear, loose threads at collar, mostly on inside but some on outer collar
-fading on shoulders, the print helps minimize it
 
40" chest
34" waist
50+" hip
37" long 
 
modern size estimate: large