BEYOND tacky...it's utterly low class and says a lot about the person throwing the shower. The new mom may or may not be privy to the details but I know *I* was involved in the details of my shower. If you go (which I would be tempted not too and if asked why, tell the truth about the tacky request), I would wrap as I normally would

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Proud to say I haven't shopped at a Wal-Mart since Sept 2003