<p>Yes, if it is wool or a wool blend, you can wash it in cool water. Use Dawn dish washing liquid, which is pH neutral. Let the garment soak for about 20 minutes without agitating.
Then rinse briefly by soaking in the same temperature water. Soak again for 10 minutes in water with a few Tablespoons of white vinegar added. Rinse/soak a final time in plain water to eliminate the vinegar smell. For added softness, you can add a few drops of baby oil to the final rinse water.</p>
<p>Spin dry on the final spin cycle in the washing machine if you have a top loader.</p>
<p>Dry flat. If it seems necessary, you can use a steamer or wet pressing cloth to block/smooth it out.</p>
<p>The variables that cause shrinkage are agitation, changes in water temperature, and highly alkaline pH. So avoid those.</p>
<p>I am a feltmaker and fiber artist, so I have lots of experience with wooly things.
Good luck.</p>