-Levis Shirt & Toddler jean jacket- (help with dating)

Hello all, as you probably can tell I am new to this adventure with vintage clothing. I have tried searching for similar tags also RN#/WPL# but no such luck. Another problem is with searching RN#/WPL# on the Federal Trade Commissions web site (seems to be for the use of the manufacturing companies only)... Just trying to find different tools to help me in this area.
Any suggestions?

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I don't know when Little Levi's were introduced but my memory says that kids versions came in during the '80s. Certainly, from the labels that's about when I would put your set.I like how there's a label for name and phone number.

I'm sure that someone more knowledgeable will come along soon.

 

Thank you Nicole