1girl, assam_(girls_und_panzer), blonde_hair, blue_eyes, christmas, full_body, girls_und_panzer, gloves, hat, holding, holding_sack, looking_at_viewer, matsui_yasutsugu, one-hour_drawing_challenge, panties, red_footwear, red_panties, sack, santa_costume, santa_hat, signature, simple_background, smile, solo, starry_background, underwear