I share that the closest I have gotten, professionally, to fashion is looking at pretty pictures :)...but the business side, I know a little bit more about..
More broadly, businesses will be successful if they are able to grow financially. One aspect of that growth is to keep costs as low as possible without sacrificing the quality of the product. One of the things I encourage you to become aware of is costs to create. Gain an understanding of costs related to things like employees, designers, materials, shipping, advertising. What does it cost if something is delayed? Is there a cost benefit (or is there less of a cost) to getting something created sooner than expected?
Whether it's fashion or some other business entity, there will always be a need to understand what causes costs and how to keep costs at acceptable levels.
Hope you find this answer helpful and best of luck to you!
Fashion Corporate entry jobs would be Fashion Merchandiser, Fashion Stylist. These kind of jobs require less experience, with little or no background in Fashion. If you are looking for something with more experience it would be Site Merchandising (making sure the e-commerce site is updated, providing good user experience for the customer). If you are more interested in this path, you can also dive into planning/demand forecasting (Buyer) roles.
Hope this answers your question.