I am an active adult in the Boy Scouts of America. I'm a Unit Commissioner in my District, Assistant Scoutmaster for a Troop, District Venturing Trainer, & Assistant Program Advisor for Venture Crew 1298 in Dallas, Texas.

As many have stated there is no official policy for kilts in the BSA regulations.
Venturing is a division of the Boy Scouts open to BOTH Male & Female youth Ages 14-20. Venturing has NO official uniform requirements, but are recommended to wear the Spruce Green Uniform shirt, and Grey Venturing Shorts.

That being said, my Venture Crew Youth and Adults are mostly kilted for events. My crew wears Post Civil War US Calvary Uniforms, Blue Jacobites & Kilts, Cowboy wear, and similar dress from the late 1800's in America. Primarily focused on clothing worn in Texas during the great move westward. We are a living history focused group. There are other Crews that do something very similar. Crew 1876 from Fort Worth, Texas does living history of a 1876 year frontier fort. They even own 6 howitzer cannons.

Since a MacLaren is the one who donated the property for the first Woodbadge in England, and MANY Founding Scouters have Scottish ties, like William Carter Beard, and the infamous Mr. Boyd who is the one who brought Boy Scouts to America, our Venture Crew supports the Scottish ways by wearing Black Watch or MacLaren. Even our Epaulets worn on the Green uniform shirt are MacLaren. The MacLaren Society of North Texas helps us put on a Highland Fling/Burn's Night Ball every year. Haggis is served. It's a great time to see the youth growing and taking an active process in learning about Highland culture.

(This should give you an idea of why I've been asking about Post Civil war 79th Highlanders from New York.) Our next goal is to have a youth 79th in our group of units.