Unknown Maker - Vintage - Size 5.5 - High Heel Boots

I bought these boots in 2005 from a shop in Los Angeles. They pair well with everything and were well loved but sadly they don't fit me anymore. They were labeled as size 5.5 when I got them but I wear size 6.5. They don't have a lot of give to zipper them, and my calves are too large (I have 14" circumference calves) to zip them up. They have a colorful, collage-style print and they are multi-colored. That said, the primary color is black. I don't know the brand as they are unlabeled. Heel height is about 3.75". There are many signs of wear, and these are 20 years old.