Re: Passing ones gift to someone else
Hmmmm, it is possible that the friend was wearing an print identical to the one you gave. Some prints and boutique outfits are often mass-produced.
I say don't make too much of a big deal out of it. Whether she wore the suit or gave it to someone else.....your gift STILL gave your SIL some benefit/use. (And that's why we give gifts in the first place...so that it be of some use/faida to the person)
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**And they're your in-laws and I'm sure you'd rather avoid starting/getting into a sticky argument with them.
Would you rather that your gift sit in some closet.....unused? That's a waste. If one is not going to use something, it's best to give it to someone who will use it. Sometimes people give suits to poor and unfortunate people.
That suit was meant to be worn.....and now it has fulfilled its destiny of being worn by someone. Your gift came in handy for your in-laws to give to someone. And that someone is using it.
Life is too short to fret over this. In the future, just get them something more multifunctional such as a gift card, kitchen ware. Clothes/suits are tricky gifts to give because everyone has different taste and sometimes a particular style doesn't suit one's figure, looks, etc.
Take it easy. You were nice enough to give a gift. It's the thought that counts :)