The Red Sox are one of those teams that it makes sense to have a Celtic BP Jersey. Irish themed products and Beantown are generally a good combination. Still no word yet if they officially wear this uniform but you can look at it below:
You can see it here.
It’s hard to tell, but that is a Navy Blue outline around the letters, which is copied from their BP jerseys. It does cause some color clash, but it is not so bad. Also, the Red Sox are the only team to have a clover patch (at least on 2/23).