Is It Okay To Ask For ‘gently Used Hand-me-downs’ On My Baby Shower Invitation?

I have several friends who have babies who are outgrowing their infant clothes and have offered them to me. It seems like it would be ashame for them to have to go buy something new for me when they already have gently used stuff themselves.
Would it be tacky to ask the person who is throwing me shower to put something like:
Registered at Babies R US and Wal-Mart.
Gently used hand-me-downs welcome.
?

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