Baby Shower dress and/or store recommendations?

Emily

Okay honestly, not sure where to shop and its a little overwhelming!! Im looking for a dress along the lines of the one below. Nothing tight, nothing strapless(like the one in the picture) and preferably not too short(since im 5'9"). Shower will be in late July so it will be hot!!

I'm considering using the company Rent The Runway? But for the price I would rather just buy a dress.

Thank you for the help!!!