As well as the waterproof bag, Aldi are selling base layers and underpants. They are advertised as being 'Bamboo'. Now my first thought was they would be a bit difficult to move in, but no, they are anti-bacterial, hypoallergenic, soft and comfortable. Didn't get the pants as they didn't have my size, (fat arse, fat arse), but the top is great.
Also got a self inflating pillow which seems pretty good.