After they crash on Jakku, somehow Poe and Finn get separated while both surviving and then the TIE Fighter gets swallowed by the Sinking Sands and explodes. (Related)
There's a lot that lacks explanation here, but what I'm wondering about is, Why was Poe's jacket left behind?
If he was in a rush to exit the TIE, he would have kept it on. If he was not in a rush, he would have kept it if it is was useful. If it was only useful to Finn to disguise his empire uniform and had no use to Poe, then he would have dropped it after he cleared the danger zone. And this is merely complicated by the fact that when they meet later, Poe seems to demonstrate at least some attachment to the jacket.
Is there any more detailed accounting of what passed during these unseen minutes?