For me, part of the excitement is wearing fun, beautiful clothes that I might not get to wear all that much hanging around home, LOL. I agree with Neviboy that no one should worry (within basic bounds of propriety---i.e. avoiding jeans and t-shirts on formal nights, LOL)....a cruise should be for escaping from worry!! I sense that some of the cruise lines are rather "stuffy" and that there might be some pressure to reflect a certain level of wardrobe aplomb....but I don't sense that RSSC is that way.
I personally have an "Elle Woods" (Legally Blonde) streak in me (wish I looked like her, LOL),and LOVE buying and wearing clothes. So, it's fun to shop for clothes for the cruise. I did buy a couple of formal outfits but nothing extravagant. I would hope that on-board friendships and social connections are NOT based on the clothes people wear or the labels inside them.......