Here's one of my grandpa from immediately post-WW2.
I don't know what hat it is but you can see he's wearing his M43 double buckle combat boots and HBT trousers with a button down shirt. And if anyone can identify the gun, let me know.
I have another one of him (framed at the moment) from the early 1950s wearing what strangely looks like a Stetson Whippet.
Not sure of the hat either but might be able to help you identify the rifle. I think it might be a Mossberg model 152K 22 long rifle. Just a guess but it looks like one.