Guys just go there and tell them your leaving, make something up to convince them that you need at the moment because you won't have a chance to get your hooks on one for a long time. It worked for me, I wear a size 48, but they had all sizes. They really just hoard sh!t for no reason....
Do it in person, beak to beak --- not over the phone. I ended my Naval career with 2 leather and 3 green nylon (the old, better ones) jackets --- and that was after cycling jackets and other "stuff" for 20 years of bartering and trading ..... a lot of other stuff, too. Do it in person ..... 