Mixed chain layer necklace

I am loving the layered look of this, but it's about 3 inches too short to look good on me. If you had a SUPER skinny neck, it would be beautiful, but on me it's just not long enough. I usually wear a L/XL shirt but don't fell like i have a large neck (maybe i do?) but the smallest necklace here fits like a choker. I was wanting the shortest one to be about at my collarbone. easy fix with an extender, but just FYI.