A little help please

I am currently in week 30 and don't want to create an entire Fall maternity wardwrobe but I do want to create a few nice pieces since there will be a couple of birthdays including my own and hopefully Thanksgiving before the baby gets here. I've been looking around for ideas (snoop shopping) and I found this dress I love.



Now I'm looking for a pattern I can morph into this or something very similar. Any ideas?