Generally, you should buy maternity clothes in your pre-pregnancy size. As maternity clothing provides extra room around the belly and bust, it gives you the comfort you need for your changing body. If you're in between sizes or are still unsure of what size to buy, consult our maternity wear sizing chart. Take measurements around the fullest part of your bust, your hips (under your bump), and your bump circumference, and compare these numbers to the sizing chart to find your ideal fit.
Spending more than £50 may seem pretty steep for maternity wear, but there's a small army of women who would argue that if you get enough wear out of your jeans, then it's worth spending over £100. I have heard great things, for instance, about designer maternity wear shop, Blossom. They sell jeans by Citizens of Humanity, True Religion and other revered brands with oddly cod-philosophical-sounding names. They adapt the jeans themselves, adding their "Blossom band". A fashionista friend shelled out about £170 on a pair of 7 For all Mankind straight legs from Blossom and says: "I wore them almost every day up until about five months after having the baby, so well worth it." Another friend of mine, who is stickler for quality, got some James Jeans for just over £100 for her first pregnancy and reckons, if you end up having more than one child, it's definitely worth the investment.
2) Not so good (although perhaps understandable) return policy. Everything on sale is no return and the one dress we liked just enough to buy, we learned at checkout was no return also (even though it was not on sale) because it was classified as an "occasional" or "party" dress. My wife was on the fence about the purchase anyway and this was enough to make her change her mind and not buy it.