Reasons to wear onesie to bed. Wife?

I recently ordered a onesie and I'm nervous to wear it around the wife though. She is accepting about me wearing and doesn't mind me wearing to bed a few nights a week. We have a kid on the and I feel she might think it's really weird with me wearing an adult onesie. I always wear a t-shirt and either pajama pants or shorts to bed. So it would only be replacing my t-shirt. I'm thinking of saying that with the onesie i can wear while other guests are staying over and not chance having them see my diaper if i have to tend to the baby in the middle of the night? Am i making a bigger deal about this than it really is or should I keep the onesie hidden?