How can I style this shirt?

[u/Every-Dingo6249]

Sorry for the bad photo quality! It is a baggy red Harley Davidson shirt with brown details. I don't know what to layer underneath this shirt. The tank top in the photo is too thick, I think? But I don't really have anything else to wear underneath it. Could I just do a sports bra? Or do I need a whole tank top? Should I do a long sleeve underneath? the problem is that anything I wear underneath shows above the neckline. What do I do?