Ok, mamas...help please!

Here's the situation: I have an interview next week in local government. I own a suit, but it was purchased 3 years ago, and definitely won't be fitting my 8 months postpartum and breastfeeding body.

Do I need to wear a suit? If not, what can I piece together? I own black pants and a black skirt that fit well. I also have a suit jacket I could wear open (black). DH says buying something is ok, so links/photos are welcomed!!

Thank you so much...I'm anxious over contemplating a new position right now, and feeling huge and like I have nothing appropriate to wear is just another thing to add on to the worrying.