The phrase "wears the pants" is an idiom that refers to the person who holds the power or control in a situation. However, there are many synonyms that can be used instead of this phrase. Some other idiomatic expressions that can express the same sentiment include "calls the shots," "is in charge," "holds the reins," or "is the boss." On the other hand, there are also more straightforward descriptors, such as "leader," "authority," "dominant," or "ruling." Ultimately, the choice of synonym will depend on the context and tone of the situation, as well as the preferences of the speaker or writer.