What Can I Wear With This?

I did try and find the top on the republic website but i couldn't find it, the other day i bought this really cute top. Its a sweatervest cardigan, with no sleeves, but not one that i'd wear oned up, so it'd be more like a sleeveless knitted cardy. Its grey with a blue rim around it, but i have no idea what I could wear it with! just for a casual going out in the day look though, ideas?