My vintage team issue Boston Celtics Champion warm up jacket from the early 1990s. I have never seen another one, and do not believe the Celtics ever actually wore these. Lettering is
Vintage Champion Boston Celtics Pregame Warm-up White Jacket
90's Boston Celtics Champion NBA Warm Up Jacket Size Large – Rare VNTG
The Celtics didn't win it all this year, but they still make me happy
MORE
90's Boston Celtics Champion NBA Warm Up Jacket Size Large – Rare VNTG
Boston Celtics Vintage 90s Nike Deadstock Team Game Issue USA Warm Up – thefuzzyfelt
Moore: How the Warriors could, once again, be light-years ahead of the NBA – The Morning Call
Every 2021-2022 NBA City Edition Uniform Explained – SportsLogos.Net News
Sixers' Matisse Thybulle does the little things on the court, in his life, in his community
Sneaker Heads, Astrology and New Year's Resolutions: Our Favorite Student Comments of the Week - The New York Times
Philadelphia 76ers vs. Boston Celtics: Play-by-play, highlights and reactions
A brief history of the varsity jacket