I usually board for extended amounts of time on trips, 10-15 days... I typically bring 2 boots, 2 gloves/liners, 5 sock pairs, 5 beanies, 5 coats, 5 jackets, 5 base, 15 t and long sleeve shirts since I use 2 a day of shirts..... most everything is the same stuff so you cant tell i change, when I find something I like I stick with it but I hate to wear wet/smelly clothes. I sweat alot so I like a couple of air out days. I also drive to my longer trips so I have unlimited amount of space to take stuff. I take two board/binding setups for each family member too.
I would take 2 of base layer, pants and jacket for a 2 day trip... Just in case I tore something on the first day. 1 of everything else since its so much cheaper than the outer wear.