What does Mark 15:24 mean?

In Psalm 22:16–18, David describes his bad circumstances in prophetic terms:

For dogs encompass me; a company of evildoers encircles me; they have pierced my hands and feet— I can count all my bones— they stare and gloat over me; they divide my garments among them, and for my clothing they cast lots.

"Dogs" is slang term in Jesus' time for Gentiles. In David's era it meant something worthy of contempt. In this moment, both descriptions fit the Roman soldiers. On the cross, of course, Jesus' hands and feet are pierced with nails. His bones are likely exposed on His back and ribs because of the extreme scourging the soldiers gave Him (John 19:1). And here, the Roman soldiers indulge in their habit of dividing up their victim's clothing.

After the guards had beat Jesus and removed the mocking purple cloak, they returned His clothing to Him (Mark 15:20). John explains that Jesus has five pieces of clothing (John 19:23–24). The guards, numbering four, split the first four pieces evenly. The last is a seamless, woven garment. Not wishing to tear it, the guards cast lots for it.

Modern artistic crucifixes often include a loincloth over Jesus for propriety's sake. However, it was Roman practice for crucifixion victims to be hanged naked, to their public shame. The text supports this.