Reading Genesis 2:25 and ambiguity of 'not ashamed'

What's up with shame in Genesis 2 but not 3, and why were Adam and Eve naked in the garden?  What were the garments of skin (and what's with these garments of glory)?      

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Music credit: "Marble Machine" by Wintergatan 
Link to Wintergatan’s website: https://wintergatan.net/ 
Link to the original Marble Machine video by Wintergatan: https://www.youtube.com/watch?v=IvUU8joBb1Q&ab_channel=Wintergatan