What a clever plan; if something would have gone wrong, you could have just washed the shirts and he wouldn't have been the wiser.
I am sure that if he is a nice guy, and given that your experiment went so well, he will love your new pup. It's always risky to get a new dog on speculation that all the humans in the house will be good with it. That is how I got my first Yorkie, Mr Pippin. The girl I got him from could not keep him becuase her roommates (who were paying rent) said the Yorkie had to go due to too much barking. Of course she kept him in the kennel all day when she was at work, and the little guy could hear the roommates and he wanted his freedom. What did she expect? But if there is no general concern in getting a little yipster, your experiment should have taken the major risk out of the equation. Good luck.