I have customised a rain jacket that has a double lining. I can fit in lots of items, i.e., shoes, small bags, small pieces of clothing jewellery etc. Can the airlines stop me from doing this (I saw it on Moneysaving Expert). Obviously I have no intention of wearing the jacket only when boarding the plane etc. I can put the entire jacket in the tray at security for scanning and the items can be easily removed. Would this be a problem with airlines (I am flying Jet2) but will be using for future travel.