First at Swayland, hunt for 10 butterflies (similar to the one I'm holding) hidden around the SwayLand Sim, When you've found them all, hit the Swayland Butterfly at the starting point to claim this unique spring dress, pose included.
While you are hunting, the vendors have great gifts out for you as well !!
Also a must, head over to the Cherry Blossom viewing 2010. The vendors have great gifts out and the sim is just breathtaking. The wings I'm wearing are from Frozen Night, 0L that can be found at their vendor kiosque.
Hair : !SyDS! @petit pas- 0L lucky board