I don't know that leather jackets on SNAs/SNFOs is a no-no. Coming through both primary at Whiting and advanced in Corpus it wasn't unusual to see students wearing leather flight jackets when it was cold enough. That said, don't be the tool that wears it when the outside temp doesn't warrant it. Also don't wear it without actually having a uniform on underneath it. It's not some jacket you throw on with your jeans to run to the store.
I shudder to think what would happen to an SNA that rolled into a training squadron wearing brown boots. Images of a jet fuel soaked student, lit on fire, and running down the flight line come to mind.
As I understand it you can have supply order them for you once you get to your first fleet squadron. I may be wrong on that, but I can tell you from what little expierience I have, I haven't see a student in the P-3 RAG with brown boots. Maybe it's different with other platforms.