Buy cheap maternity basics
If you buy some cheap tanks, t-shirts, pants, shorts, jeans and leggings you can combine that with every cardigan, kimono, blazer, scarf, jacket, etc that you own. You don’t have to get all of them if you don’t want to of course. Just get the ones you’re comfortable in. I have to warn you though, over the belly-maternity pants and leggings are insanely comfy.
You basically don’t have to buy anything else and you’ll be fine. Maybe not for a party, but for anything and everything else. It’s obviously not high quality things, but you really don’t need that. You’ll be using these clothes for a short few months.
A great place to find cheap basic maternity clothing is Amazon.com.