I love a summer smock dress, its such a useful thing to have on holiday.  If you are pregnant this can be a great style of dress to invest in as it works well with a bump (with leggings if its to short), then its super comfortable to wear afterwards.

I recently got this one from ASOS its really light weight and cool (temperature and looking). 

Here are some alternatives:

Little White Lies £95 / ASOS £25 / Jovonna £55 / Zara £35.99