@alibilal , you should be able to get this set up using our app, Discount Bot. Do you want this discount applied directly to the products or at the order level (we support both types of discounts).
Here’s an example of how you can set this up as a product discount:
There are also other options you can choose like for example only applying the discount on up to 2 jackets by setting a maximum discount quantity as well:
If there are any questions, please reply.