White bomber yellowing
 

Bought a white bomber 3 years back and didn't wear it much. It is mostly kept in a closet and when I do wear it, its dry and not raining. It has come to my attention that my jacket is yellowing despite it being a closet queen. What is the proper way to care for it and to salvage the jacket?

TIA

You could try Mrs. Stewart's Concentrated Liquid Bluing?
Or Nellie's All-Natural Oxygen Brightener, which I know they sell at London Drugs.