Removing Odor from Synthetic Leather Jacket?

I purchased a brand new, synthetic leather jacket with an inside lining from a "New Look" store. The jacket smells of fish, I did not notice this in the shop. It's a very unpleasant, strong smell that seems to have gotten worse as the past few days have gone by. I would very much like to rid of the smell, it also makes my clothes underneath smell, too.

Does anyone know how I can get rid of the horrible smell? I would really appreciate it, thanks.

By Ellie from England