It is a really difficult one. I have contacted all the big runner shops to ask for advice. I am running at 10weeks and, at the moment can wear my usual stuff. I would hate to have to wear oversized 'new year resoluotion people' jogging bottoms. You know the image we all hate - the huge t-shirt and leggings. I want to wear serious clothes, especially as I get much warmer now and will intend on excersing in hot weather ( I am due in August). I have so far recieved only one helpful email from Jo Thomas:
Sorry for the delay in replying we did not re-open until Tuesday 4th. Insport did at one time feature maternity clothes in their ranges, they found that demand was not high enough to continue as most ladies stretched there usual size up to 18-20 weeks and after that were happy with out sized not technical gear as they were not doing so much, they found most runners reduced to low mileage and walk/run.
In the ranges that we do I would suggest looking at the Röhnisch Active range the T-shirts and sleeveless style are generously cut and nice and long, they are technically very good. At the moment we only have trousers from the range but we can get the shorts. They also do maternity but only one style of top and trouser which is designed more for relaxation classes. You can see the Active tops on the website we have black at the moment but could order white, red or navy for you if you wanted us to.
Kind regards jo
Hope this is of use.