I found this website while searching for pioneer clothing: Fibers of Function. They have a page with bits from the diaries of people (mostly women) going west on the Oregon Trail which mention clothing.
I particularly like this one from the diary of Helen Carpenter:
June 19, 1857
Six days past Fort Kearney, seven to Courthouse Rock
… There is a bride and groom in the Inmann party. The bride wears hoops. We have read of hoops being worn, but they had not reached Kansas before we left so these are the first we have seen and would not recommend them for this mode of traveling. The wearer has less personal privacy than the Pawnee in his blanket. In asides the bride is called “Miss Hoopy.” Fairly good grass in camp and willows for wood.
All of her entries were fun to read, actually. She seems to have been from a rather well off family, or else she just made a particularly comfortable trip.