The bust area is lined and is definitely not see through, just tested it. the abdomen part is not lined, so if you have another shirt under it I'm sure it's color will show because it's white, but it doesn't look bad or trashy. : )
CORRECTION!!!!!!!!! This shirt is not at all see though!!!!!!! i was an idiot and thought i was talking about another shirt i have listed!!!! I repeat this shirt is not see through!!!!!!! the entire shirt is lined!!!