Thank you so much for looking into this - your investigative skills are much more sophisticated than mine! The information that you found is very helpful.
I found this picture and the label on the bottoms right, although only a portion of it is visible looks to resemble the one on my shirts.
Look at them labels, the two variations I found, on one the shoe had been flipped and on the other the shoe was pointing down.
The three labels in your image, top left, bottom right and near top center do all look similar to yours.
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