Jess found a costume with a long tail and found it to be some kind of sea-serpent, but it had arms and legs with clawed flippers. She took it down and started getting it on.
It took her a while as the tail kept getting in the way, but eventually she got it on.
Jess tried walking and found that while her big clawed flippered feet were awkward, her tail got in the way even more. Maybe with a bit of practice...
Suddenly a strange feelng came over her and she felt like she was getting bigger..longer..