With clothes, make it cheap so if you make the wrong decision it's not a big deal.
Also recognize you're engaging in the sunk cost fallacy by keeping clothes you don't actually want, and you're making the world better by allowing it to go to an owner who would better appreciate it.
Some more concrete ideas:
1. thrift stores
2. clothes rentals
3. clothing swaps
4. Buy the cheap version of what you think you might like (if it exists) first before buying the expensive version
5. Don't make your entire wardrobe trendy clothes. Make most of it relatively classic / basic and limit "trendy" to a subset of items.
Also recognize you're engaging in the sunk cost fallacy by keeping clothes you don't actually want, and you're making the world better by allowing it to go to an owner who would better appreciate it.
Some more concrete ideas:
1. thrift stores
2. clothes rentals
3. clothing swaps
4. Buy the cheap version of what you think you might like (if it exists) first before buying the expensive version
5. Don't make your entire wardrobe trendy clothes. Make most of it relatively classic / basic and limit "trendy" to a subset of items.