mesh seemingly apart of sim but only is cas?

I know I've been making a lot of threads with questions lately but I'm new to alll this so I'm bound to have lots of questions I tried making a jacket that was meant to be unisex but it the mesh itself was created on a female sim model so when on a male sim or even a female sim with a smaller chest the mesh would get messed up in the chest area and fold in on itself? So I tried fixing with in the tags and warehouse but now when a sim is nude in cas, specifically when putting on tatoos the jacket is on them Speed Test vidmate.bid/ ?? I'm not sure why and it doesn't affect the game as when a male sim is shirtless in the actual game he is shirtless but in cas he has the jacket on so it's not a huge problem but it's just weird and I want to know why this happened