Late 50s early 60s day dresses ?s

Me again!

At first I though these extra large day dresses were all early 60s, but now I'm confused. With the exception of the first one, they all have metal back zips.

This one with butterflies very 60s looking flowers has a metal side zip; so is it 50s?





Same belted shift style as above but with a back zip:



The belt loop on this one is high up - kinda reminds me of a 50s Dior by YSL as far as the belt position goes.



This one does not have a belt loop. Would it be like above or lower and late 50s also:






THANK YOU!!!
 
What kind of fabrics are we talking here? Cotton, nylon, triacetate? (cotton, slick)

They are striking me as mid/late 50s on the top two, then mid/late 60s on the lower
 
Thanks! They're all the same type of fabric and I'm pretty sure they're nylon (I'm not familiar with triacetate; so they could be???) Would you belt the last one like the one above it?
 
l think youre pretty sfae to say they are all late 50's dresses, or cuspers..especially with the different options on belting wearing levels!!
 
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