Aha! Mystery solved!
Did you declare them as children’s clothes specifically? If they were just declared as clothing then maybe it got through customs on that basis. Or even if declared as children’s, sometimes things get waved through on an ad hoc basis, maybe? I suppose VC has to adhere to the official requirements as policy, but as a private individual sending such things, it’s easier to get it to slip through? I’m just speculating.
Used kid's clothes and marked it as a gift with a rough estimate of how much they would be resale. I might be wrong but I think different rules apply if they are from a company or privately sent?