Harrods Girl's SS06 must have fashion item

This week's carnivale (host by The Bag Snob) question is:
What is your one must have fashion item for this Spring/ Summer?

This season, I'm crazy for simple, fashionable and pretty tops, in particular white and ivory/ pale coral color ones. Actually this craze of mine already started last fall, so I already have a few tops of such colors: A subtly beaded ivory, long-sleeve tee from Express; A boho, Balenciaga-'inspired' top from Zara; A white, crochet top from Marc by Marc Jacobs. OK, so may I won't actually need to buy too many more of this kind of tops, but it's so lovely to just stare at:

This Alicia + Olivia top is perfect for the warm spring weather. Although one must be careful with this top, or it will end up looking like a table cloth on you!

Another excellent top for the spring weather, from Cacharel. This one is less tricky to wear, but slightly boring.

This top by Marc Jacobs is soooo chic and casual. I love the ivory/ pale coral color, and the crochet details are so brilliant. Jacobs always knows how to make a girl swoon!

Pretty pretty blouse from Burberry Prorsum. The little bow in the front is cute in a non-sugary way.

White with black details tops are another must-have. I can't get enough of Miu Miu tops (right,) and the Chloe top (left) is just tres divine. If only I was rich and working...

Finally, this is obviously not white, but I am in LOVE! This Vanessa Bruno Trimmed Batwing top comes in coral, white and grey. Coral and grey are my favs because the white doesn't accentuate the fabulous details properly. Gosh, if I saw this top in a shop (as opposed to online,) my credit card might burn!