Two possibilities. I'm not sure if the store requires a member account (it does for some items). In that case, the account you're using must have your MRN connected to it. Otherwise, it sees you as a non-member. Non-members are not going to be able to order things like temple clothing.
The other possibility is a cookie issue. Church websites have problems with cookie building that comes out in strange ways. Try using Incognito or private mode of your browser. If that works, then you need to clear out the church cookies from the browser.
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