Boots were my saviours when I had my second child, this is because he was born 6 and a half weeks early and only weighed 3 pounds, all the baby clothes I had bought and that people had bought for me were all far too big.
We did have a mad panic trying to find clothes that would fit our special little boy, and thanks to Boots we did not have to search no more.
I have to say that although the clothes fit perfectly they cost the earth, but you can't have a baby in a baby grow that drowns him. The cost was around £11 each and I'm going back 6 years now, the choices were nice and cheerful. Boots had a lovely little all in one suit for premature babies and I couldn't resist getting it, it was lovely, it cost £25 and he only wore it twice.
The range of clothes for babies are good and the designs are cute, but you may find if you have a boy as he gets older your choices will be limited.
People asked me why I didn't try mothercare or buy dolls clothes. In answer to that, mothercare had 1 item for premature babies in Pink, as for dolls clothes, has anyone seen a male doll which you can dress up? No, I haven't and even if I did I really do not think that I would be tempted to buy them.
All the premature clothes I bought will get good usage as I donated the whole lot of them to the neo-natal unit of my hospital. So in the end it is money well spent.