This question applies to the fab KC tunic as well as the cream Bellatrix tunic I'm wearing in my Hinge jacket thread.
These tops aren't see-through by any means, but you can definitely see bra outlines and especially a line of demarcation where dark jeans sit under the top. A cream cami (untucked) helps, but then you can see yet another line of varying shades. In my KC tunic, you can see the sheer cream of the top, then a line where the cami stops, then my jeans.
Does that make sense or should I add a picture? I just want to make sure it doesn't look messy and odd.