Help coordinating an AP salopette?

[almondfawn.livejournal.com]

Hello everyone ^___^ I know that salopettes aren't technically considered "lolita", but I was wondering what I could wear underneath it. I have AP's "Toy Fantasy" in the black colourway.
I want to wear a cutsew under it instead of a blouse, to keep it casual. Would any pastel//matching colour t-shirt look alright under it?
Anyone who has experience with this salopette? Thank you! ♡