Heyy every one i am making a dress for a semi-formal that is coming up and i wanted to know some tips!

.::Here is a picture of what i am thinking of having the dress look like::.
I already have the fabrick it is a light sea fome green color (mabe more bluer)
I was woundering if i should also have the back skrunched and if I do should i use an invisable zipper or no zipper? Oh and I already figured out how to make the skerunch.
xo Hope you can help! xo