At about 12 weeks pg I went out and bought a few tops and a pair of pants 2 sizes up (went from a 10 to a 14), and at about 20 weeks pg I started wearing some of my maternity clothes, though the tops did look a bit big for those first weeks.
Up until 38 weeks pg I was about to wear size 16 non-maternity jeans and shorts, under my belly... and then for tha last week of pg I just lived in trakkie pants