jumper

1 :  a child's coverall —usually used in plural

2 :  a sleeveless one-piece dress worn usually with a blouse

3 :  a loose blouse or jacket worn by workmen

4 chiefly British :  sweater 2a

1 :  someone or something that jumps

2 :  a sleeveless dress worn usually with a blouse

:  one affected with latah or by the condition exhibited by the jumping Frenchmen of Maine