You and peeta were outside in the woods two weeks before the reaping.

The night before you guys went out it was raining a lot so because you guys were in the woods it was logical that there would be big mud puddles that you could ruin your shoes if you proceeded to walk through. And as you were walking deeper in the woods you came a cross a big mud puddle

At this point you knew that your shoe will indeed get dirty. Just then Peeta hold your hand and placed it around his neck and proceededs to carry you in princess style. He lifts you up and he begins walking on the puddle meaning his shoes were now staid with dirt