Gift of clothes this Christmas?

Absolutely not. I think most givers want their gift to fit well, and understand that sizes are variable.

ya save it to give someone else as a gift

No. People don't always get the right size or sometimes even though the label may be correct the garment is off.

No its not rude.

do not say this to giver. Go to the correct store and exchange for right size.

I know a guy who deliberately buys his wife clothes a few sizes too small. (she just exchanges the size) she asked him once why he always got a size 8, when she wore a size 16. He told her that he'd just look around the store until he saw a woman who looked to be her size, and ask what size they wore. She was so touched that she never chided him.

He told me once, that he made the mistake of buying her jeans in her real size, and she got upset and said " Do I look fat?" So now he always buys them too small on purpose, because it makes her happy.