Ascenaretail-my.sharepoint.com is not a standalone business or online store. It's a SharePoint portal hosted by Microsoft, likely used by employees of Ascena Retail to access internal files and collaborate. You'll land on a Microsoft login screen (login.microsoftonline.com) before you can see anything else. That redirect is a good sign: it means the site is using Microsoft's official authentication system, which is as secure as it gets for a corporate login.
Because this is a private portal, you won't find public reviews, a Wayback Machine history, or a sitemap. That's normal, not suspicious. The site blocks search engine crawlers, which is standard for internal company resources. The security headers, valid certificate, and clean blacklist status all confirm this is a properly maintained Microsoft service.
If you're an employee being asked to log in here, check that the URL after redirect is login.microsoftonline.com and that you see a legitimate Microsoft login form. That's the only real caution. Otherwise, there's no reason to treat this site as anything other than a trusted corporate tool.