Wrote them an email asking about shirt fit comparisons to other barnds:
I was wondering if someone would be able to compare Gustin shirt fits to
larger brands like Gitman Vintage, Band or Outsiders, Wolf vs Goat, J Crew,
Received a pretty useless reply as it doesn't give any real information beyond what I could get from the measurement charts:
The best way to find your fit is using our fit guide https://www.weargustin.com/fitguide. But if you would like to try on a shirt that is pretty comparable (but not exact) Gitman Vintage would be a pretty good option. Hope you like the shirt. Thanks for being a fan. Keep visiting our website and check out our new campaigns.
I disagree with the Gitman Vintage. The armholes on the Gustin L are about 10", which are very high in comparison to GBV. And it fits slimmer in the body and doesn't have the Gitman flare out at the bottom. In the past I've had to tailor the Gitman L to slim down the body, but the Gustins are ideal for me in that department. And the Gitmans are a bit longer.