Cheap Mondays tend to fit small, although they are not all consistently sized. The raw denim stretches a bit but depending on which season's raw denim you buy, they may be small or true to size.
and they shrink. my boyfriend normally wears 27/28s in sass and bide, but has to wear 29 in ksubi and 30 in cheap mondays. and his cheap mondays are still his tightest jeans. hope that helps!