How should I dress my 13 months for an OUTDOOR photo shoot?

I have a photo shoot coming up outdoors. I was planning on putting him in a nice plaid shirt with jeans. But now I’m worried because the weather. It’s supposed to be 11 degrees (53 f). It’s also calling for possible rain (which fingers crossed it doesn’t as that would ruin everything), but forgetting about the rain, how should I dress him?

It’s a fall photo shoot. I want it to look nice obviously, but I’m worried if he’ll be cold? It’s only 15 minutes...so I figured what if I dress him in a short sleeve onesie, a long sleeve onesie on top, and the plaid shirt on top of that? I could put a beanie on him as well to keep his head warm and then keep a jacket on him just before we start taking the photos. Thoughts? I’m worried he’ll be cold and I’m a bad mom for even considering it..but I also want cute family photos 😂