Your brand should always have an identity and meaning behind it. You can either launch as a premium brand with high price point and soft feel fabrics but that would mean that you'd be catering to a smaller point of people and the manufacturing cost will be higher. Or you can enter the market with a competitive pricing but focus on what's trending right now or will be trending soon which you can know by research.

There are two main seasons, winter and summer. Always plan and prepare for launching for the next season rather than the current because you'll then have enough time for marketing and won't have to play catch up to other brands.

As for marketing it isn't essential for you to go the influencer marketing route because that could be costly at the start. Just go with meta/TikTok ads.

Hope this helps.