Girls, I'm choosing clothes for my little one, I can't decide on the o…

Girls, I'm choosing clothes for my little one, I can't decide on the outerwear ? I can't understand the difference between a going-home set and an everyday one? What's better a jumpsuit or a conventer? Are some sets have both a jumpsuit and a conventer? Won't it be cold in just a jumpsuit without a cover?? How did you choose this piece of clothing?