Great idea to save money and give some versatility. Maternity coats and jackets that can be worn during, after and for baby wearing are very expensive so this type of option is way that more can find something affordable. Unfortunately for some like me they had no compatible zippers to work with any of the 5 coats or jackets I have. They don't offer a custom zipper if one isn't available. Great and friendly customer support though. If you have a suitable zipper or attachments are available give it a try. Definitely check before you buy!

http://makemybellyfit.com/

I was pregnant during the winter months and I could NOT afford a maternity coat. Make my belly fit was the PERFECT solution. I loved that I could wear my own coat, and that I could wear the baby under it after he was born! :)