Only one squadron for the US if it had to see combat: VMF-221 at Midway. There's really not a lot of options as far as skins for the Brewster go.
HTC's guidelines in the sticky skins submission post at the top of the forum says nothing about an aircraft having to had seen combat. The relevant passage says: "We will only accept skins that were historically used in World War II".
Now it is not a hard and fast rule that if it was used in WW2 in any capacity it will be accepted. For instance the garishly coloured lead ships used by USAAF bomber groups are not allowed. A skinner should always get HTC's approval before spending time on a project that is "dodgy". OTOH we have skins of fighters that were used by training units already in the game (one Seafire and several N1Ks).
So USN or Australian based RAAF Brewsters would not necessarily be rejected out of hand. Its certainly worth an email to Skuzzy to find out.
A Brewster F2A-1 Buffalo VF-3 squadron.
When Butch O'Hare finished his naval aviation training on May 2, 1940,he was assigned to USS Saratoga's Fighter Squadron Three (VF-3). O'Hare now trained on the Grumman F3F and then graduated to the Brewster F2A Buffalo. Lieutenant John Thach, then executive officer of VF-3, discovered O'Hare's exceptional flying abilities and closely mentored the promising young pilot. Thach, who would later develop the Thach Weave aerial combat tactic, emphasized gunnery in his training. In 1941, more than half of all VF-3 pilots, including O'Hare, earned the "E" for gunnery excellence.