Mystery ... Unsolved

Maybe you can help figure this one out.

See these T-shirts and various tops?

Each one has a hole in it.
Yes, even the brand new ones.

Smack dab in the middle of each shirt by the "belly-button" area.

I looked at where my seat belt lays ... nothing, no metal or plastic buttons nothing to snag onto.

My desk? Nothing. It's a smooth Corian top and the drawer has nothing it could snag on.

Belts? Nope, rarely wear them and when I do, it's not with the clothes I wear to work.

Hoodie zippers? I though I may have a zipper that has a sharp piece on the inside that catches my T's ... but most of these short sleeve T's are new, this summer, and I haven't worn a hoodie.

NO! I don't have a pierced belly-button. I would if I was younger or if it wouldn't get lost in the roll when I sit down.

So I just forget about them.

Until...

I went to lunch with my sister Sandi.

She commented on the light pink T I was wearing (that Sonia made).

I said, "Yea, I like this too, but I'm bummed because look, (as I poke my finger through the hole) I have a hole right here."

She said, "OMG, I get those on my T's !"

::: blink blink :::

Then I proceeded to tell her how ALL my T's have this hole, all in the same place.

So do hers!

Hu?

We don't have any similar daily routine that would explain this.

Please anyone?? Any ideas ?? Suggestions?? Do you get these holes too??

Now I am spooked because it's not just my T's.

If nobody can figure this out, I will be totally convinced my sister and I are being used by aliens to satisfy their pleasures. But via belly-button?