This is an accepted solution.
I just had a quick look at your store and hope my suggestions below might help you.
1. Add a favicon to your store
This small but powerful icon can help strengthen your brand, as well as make your store unique. You might want to check out full tutorial from Shopify: https://help.shopify.com/en/manual/online-store/os/using-themes/change-the-layout/theme-settings/add...
2. Use Testimonials and Trust Badges to increase your visual credibility
Try to add a review section as social proof. Personally, I would go straight with the customer's reviews before making a purchase. Since you are offering a high-end (?) fashion with unique look, it will help you leverage your current customers to sell to potential customers, and it is also a powerful sales tool.
Start with your best customers and reach out to them on your social media for feedbacks. Then you can either add your best customer's reviews in Home page or Product Details. See more at: https://www.shopify.com/blog/customer-testimonials
Trust badges also help you skyrocket your conversion rate. It is natural that customers will have doubts about your service, provide them payment assurances in the checkout page.
3. Write a headline and subheading with a CTA (Call-to-action) button
Write a headline to grab the attention of your audience. People would like to know what your business is about and what you are able to do with it. Make sure people can tel what you sell within 5 seconds. It should be a short description of:
Sub headlines: Why your customers should choose you and their benefits. Add a short description in each Collection also.
CTA button: Give them the chance to take action on your home page (what to do next). Think about how to redirect audiences to the page you want them to take action.
I found this course that might help you with Web Copywriting: https://www.skillshare.com/classes/Copywriting-For-Beginners-How-To-Write-Web-Copy-That-Sells-Withou...
4. Shopify Popups and Announcement bar
5. Product details
Follow this guide to add a size chart: https://help.groupthought.com/article/842-how-to-add-a-size-chart-to-your-product-pages or customize your size guides here: https://shopify.dev/tutorials/customize-theme-add-size-chart
6. Use visual elements
Read our Web design tips tricks for a professional site that converts for your inspiration.
Above are my recommendations to your store. Like it or mark it as a solution to let me know if it is helpful for you.