Picture of Quick and Dirty Infant Over-alls
Quickly turn an old sweater into overalls for a baby.  

Step 1: Materials

Picture of Materials
You'll need:
1 old sweater with baggy arms
1 outfit to use as a pattern
Sewing machine or needle and thread

I used a wool sweater for warmth and to act as something of a diaper cover.  Fleece or a sweatshirt would also work nicely.