It's heavier, yes. But it also protects better than before. So perhaps it's not quite as much 'casual clothing' any more, but it is a really comfy suit of armour/vacc protection, and the description does say they get thinner and easier to use as TL increases which was basically the deal with the tailored suit too.
Besides, 8 kg isn't too heavy to wear for extended periods of time, as long as the weight is distributed well.