Lighter clothes. You mention jeans. Denim is heavy and takes forever to dry. Replace with lighter weight fabrics which also dry much faster. These can be cheap (I have a pair of nylon/spandex Wrangler pants from Walmart for $22) or expensive (I also have some tech fabric lululemon pants which are $100+), but the commonalities and advantages over denim are greater stain resistance, much faster drying, much lighter weight, and greater breathability.

I just weighed my pants and my jeans range from 24-28 oz while my tech fabric pants range from 13-16 oz. That's close to a 1lb difference or .4kg just from a pair of pants. Replacing 3 pairs of jeans could easily save you 1 kg in mass. Similarly, lighter weight shirts, shoes, etc. can all save you significant mass.