My daughter has taken a real dislike to getting dressed (she's 2-1/2) and although I follow a non-reward/punishment style of parenting it's getting acrimonious and I've sometimes resorted to offering a treat if she'll do it.
I offer choice (including her favourite t-shirt if it's clean), ask her why she doesn't like it (she just likes being naked, she says), explain why we have to get dressed when we go out etc etc.
Any advice?