Maternity dress help!

Ahine • Cake decorator, stay at home mommy to two and bad ass feminista, and makeup obsessed https://www.facebook.com/thevintagemixerbakery/
So I'm torn between these two dresses to do my maternity photoshooty. I want to wear a slip with both but I'm a little worried with the longer one it will look funky since the slip will be knee length. Also the smaller one is $6 and the other one I think $20 so there's that😂 there's a stock photo of each and then below a picture of someone that actually brought it and wore it.

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