Some clothing items come with hidden or secret pockets. You can use these to carry cash safely. Travel pants, jackets, and even underwear often have these features. They're especially useful when traveling, as they add an extra layer of security.
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Money belts and neck wallets — those flat, cloth pouches that fit under your clothes — are the traditional ways to carry money safely while you're traveling. They're meant to escape the notice of pickpockets and muggers, and some even have RFID blocking to keep your credit card and passport information safe.
YOU ARE ALLOWED TO CARRY AS MUCH CASH AS YOU WANT OUT OF AND INTO THE UNITED STATES. To summarize up front: no, you are not restricted to traveling with sums of $10,000 or less. In fact, you could travel with a checked bag stuffed to the brim with cash — as long as you declare the amount beforehand.