Irina, my strategies are similar to yours, Tanya's, and Jenn's. HIGH FIVE
I barely wear workout wear - only for yoga - and have very few items. 3 sets to avoid laundry bottlenecks and they last for years. So I avoid polyester and nylon quite successfully that way. That said, I do buy and wear a few recycled polyester blouses because they work for me. They are very robust - and that in itself is a sustainable strategy.
We have very limited storage space in our loft, so I don't have a large wardrobe. That keeps the shopping even more disciplined!
I de-pill the living daylights out of my knitwear to make it look new. Unlike some, I am not okay wearing worn items unless they are jeans and I'm on a trail or at the beach with the doggies. I recycle what I can when I pass on.
I am a big outfit repeater and wear my pretty clothes! I enjoy it.
Actually, my non-style life is more sustainable, and I'm nodding along with kkards. We walk to most places. We are also HUGE ON ZERO FOOD WASTE. I could start a blog about that. My strategies on how to use food so that you don't waste it is something I am passionate about. Surprisingly, the food waste in the US accounts for a much higher percentage of carbon emissions than airplane travel. Food does not decompose as well as we think it does, and releases loads of toxins.