It sounds like you're describing a baseball jersey with the phrase "Love is Love" on it, with the color black and size medium. "Love is Love" is often used to express support for LGBTQ+ rights and equality. While I can't provide specific shopping links, you might find such jerseys available online through various retailers that specialize in LGBTQ+ merchandise or custom apparel. It's always good to check with local LGBTQ+ organizations or Pride events as well, as they often sell merchandise with similar messaging.
