My story is somewhat complicated.
Around 1960 I saw a German movie where a guy was taking a shower in the jungle (bucket with holes in the bottom) in a g-string. I was intrigued by the g-string and made one myself from left-over fabric of my sister's sewing project. I wore it a few times at the beach but it fell apart.
In 1980, g-strings and thong became popular in Europe and I bought my first ones in St Tropez, France. I wore them at the beaches around St Trop.
Since 2000, I'm a full time wearer of g-strings and thongs, underwear and beachwear.