The luxury of letting go of the old and resetting with the new lets you keep the fundamental things that give you pure joy and wholesome pleasure. Those fundamentals being tokens that ignite powerful memories of experiences you've had throughout your life that have had a formative effect on your psyche.
You rid your closets of worn fashions - symbolic reminders of peccadillos past that no longer suit your seasonal needs. It is the great purge - the formation of your new character for the new season...a new hope and inspiration for your upcoming ventures.
Out with the old and in with the new fashions, the new ideas, the new outlook for great new experiences and joy - while guessing which of your new articles will be those same tidbits that you hope to cling to next year as you keep those fundamental tokens of happiness during your next great purge.