Alaska helicopter excursion clothing

[MarriedAtDisney]

hi all. Alaska trip in august and we have the excursion booked where we helicopter up to a mountain top and interact with a dog sled team. Has anyone here done that excursion and if so what kind of clothing do you recommend? Boots, heavy coat, ski gloves? We're so worried we will over or under dress.

In general any recommendations for clothing for this trip would be greatly appreciated!