To me simple living means decluttering and frugality. It is synonymous with contenment. It means having less, not in a minimaliste sense of having empty space, but having carefully and purposefully chosen items that are fewer and suits our life better...
Which means simple living is also deeply linked to anticonsumption, at the antipodes of a life style where we always want more of things we don't really understand and where we don't really enjoy what we have.