Your leggings should not be sheer! All of our products are designed to be completely opaque!
The leggings in particular are very form fitting, so it is personal preference whether you are comfortable wearing these with tees or longer tunics/dresses.
If your BLANQI is not completely opaque, then it is possible you may need to size up in your item. Here is a quick link to our size guide: https://www.blanqi.com/pages/size-guide
If you should need to exchange for a new size, we have a super easy exchange process that you can access right here https://returns.blanqi.com
Please let us know if this does not help you, we want you in the most perfect item!