I accidentally flashed my friend because my bikini bottoms are too loose. How do I fix them?

I was at the pool yesterday with some friends and I was wearing a new high waisted bikini I just got. I was sitting on the edge of the pool with my knees up to my chest for a few minutes until my guy friend swam over and told me that my bikini bottoms weren't covering anymore. I looked down and saw that my bottoms had shifted down and you could see everything from the side. I was so embarrassed! I thanked him for telling me and quickly adjusted my bottoms.

I really like these bottoms but I don't want to worry about flashing anyone when I wear them. What do I do?

I accidentally flashed my friend because my bikini bottoms are too loose. How do I fix them?
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