This is the type of dress form I have. It's fit perfectly to my body. I do have the boobs and bum padded out but the outside cover lets me pad it to perfection. It's the same basic idea as covering it with a jersey or knit or leotard covering but without (IMO) the hassle of trying to fit the cover to the form.
I don't like this..... I LOVE IT!!!!! Did you use a fabric marker like in the link you posted or use something else? I love this bag! Sadly, I don't think I have the drawing abilities to make it... sewing, yes, drawing, no.