As head of the household, you could tell your wife that you would prefer that she not accept gifts from non-related men, even if for your children.
If you get any more suits from anyone, take it to your nearest donation bin so some poor JW can buy it for 25% of the original price. Just as you would do with any gift that was impractical or inappropriate. Unless you have the receipt or it is from a known store. Then return it and buy some more onesies. You now know how many you can go through on even a GOOD day. :)
Congratulations on the little one! What a gift