The most sustainable fashion is wearing the clothes that you already own. Look into your wardrobe and extend the life of your clothing. Don't be afraid of people who seem to lead perfect zero waste lives (they don't) and are buying a lot of expensive ethical and sustainable fashion. You can make small, but effective, steps forward by re-wearing your own clothing. It starts with a really simple action.
A great way to start your journey in ethical/sustainable fashion is working with what you have and slowly incorporating sustainable items. If you still need a fix for “trendy items” try visiting your local Goodwill and give an item a second life.
My Roolee pants feel like quite the bold statement item for me and yet they were surprisingly versatile when I just put a few minutes into styling them!