i can only tell you what we usually do (mine is 7 months old now).
for indoors she normally wears sleevless/legless vest, with long sleeved top and trousers. If wearing a dress, i put the vest on first, and leggings underneath (i can't do tights owing to my disability making it difficult)
for going out, when she was little we had a vest, top and trousers, slippers (or sleepsuit) plus 1/2 blankets (this was the summer though) now she wears all that, plus a cardigan and coat, and we have a cosytoes for the pram