Have you tried Wardrobe Wizard? I have pretty good success with converting V3 or A3 footwear to other figures.

There is a pair of boots with a dress at this link. It's the only boots I saw for Jessi in the MP when I searched for Jessi related items.

http://www.renderosity.com/mod/bcs/index.php?ViewProduct=38047

There might be others under "shoes" or "boots", but I only looked for "poser 6 only - Jessi".

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi