It's Border Protection, not Patrol. Everyone does that!
I thought it was odd you didn't post a 10 digit tariff number. Any country that's a member of the WTO uses the same first 6 digits, but the US goes to 10, and Canada to 8.
Chapter 40 is for rubber and rubber articles. Chapter 61 is for clothing and accessories, knitted or crocheted.
First screen snip is for the drysuit. Full classification would be 4015. 90.0050
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Just saw your post edit. Putting drysuit undies as swimwear? 6112.31. 0010 Wrong!
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I'm off to the CBP CROSS rulings database to find the Fourth Element undies ruling request I found in the past.
Not that it matters that much to me but was the undergarments an error in my favor or against my favor?