A few years ago, I had a business trip to Bolivia. I knew I was going to stay a few days after the business was over so I decided to buy some technical clothing (clothing that is designed to be rugged enough to be activewear, but also doubles as dress up clothes)—a technical colored shirt, suit pants and a suit jacket. This technical suit was designed so that I could pull it out of my bag and wear it without it showing any wrinkles. I wore the suit for the business meetings, but then used it as my primary clothing while I went out hiking and exploring. I used the suit coat as
an extra coat when the temperature plummeted out in the desert at night. That multi-use clothing allowed me to stay on from business and explore one of the most interesting countries in the world all with two pairs of clothes (one being the suit). I was able to stand on the salt flats covered in water and see a perfect reflection of the stars above me, and walking along the banks of Lake Titicaca buying food. I did all of that in my technical suit pants, that doubled as the most comfortable trekking/hiking/everyday pants I had worn. When I returned, I wore that suit to the office and then I began wearing it on the weekends when I was out canoeing or hiking. I now have several pieces of technical clothing (made from merino wool or other technical fibers that allow for durable use); and they has become the majority of what I wear every day.
Children are, on the whole, harder on clothing than their parents. My guess is very few parents are changing their clothes several times a day because they are covered in mud (or avocado, or crayon, or any other substance a child got into while playing or exploring). Parents rarely have to throw away clothing because they have ripped them on the playground, or worn out the knees. Children deal with these issues. Children more than adults should be able to have clothing that is designed to be activewear, but is also comfortable and can double as dress up or dress down normal clothing.
Technical clothing is more expensive than regular cotton clothing. Most of the reason is that the fabric used in technical clothing is much more durable and more expensive. The clothing is comfortable, durable, looks nice, and is stain and smell resistant, meaning it wears well for several days. I also have yet to wear out one of my technical pairs of pants, no matter how much I wear them. We are confident you will be taking these technical clothes on many, many adventures before they even show signs of wear.