My DGF died when I was 16yo. He died in the February, quite suddenly.
In the July of the same year, I was in the local shopping centre, which is the same one he used to go to each week. It was a very hot summer, so most people in shorts, tshirts etc.
I saw my DGF, up ahead of me, turning into one of the shops that he went in every week when he was alive. It was him to the point that I shouted and ran after him. When I got to the shop, it had closed down weeks earlier.
The thing was, he was dressed for winter, full long coat, hat, gloves, scarf and a very distinctive hat. I am adamant that it was him. I also felt a wave of love at the same time.
Years later, DS1 as an adult, bought a hat just like my DGF. It's not fashionable, but DS said it felt like a good hat and that a kind old man in an overcoat, in the shop, told him to buy it. When I asked DS he said the man had a full long coat, hat, gloves, scarf. The man also shook his hand and said he was proud of him.