Cap-a-pie is an archaic phrase that means from head to toe or completely armed. There are several synonyms for this term, such as entirely, thoroughly, fully, completely, totally, wholly, comprehensively, exhaustively, and perfectly. These synonyms can be used in a variety of ways to replace cap-a-pie and convey the same meaning. For example, you can say "he was fully dressed in his uniform" or "the house was thoroughly cleaned from top to bottom." Whether you use cap-a-pie or its synonyms, the important thing is to communicate your message clearly and effectively.