1girl, black_hair, blush, boots, bra, breasts, brown_eyes, christmas, cleavage, full_body, girls_und_panzer, gloves, hat, holding, holding_sack, large_breasts, long_hair, looking_at_viewer, matsui_yasutsugu, navel, nishi_kinuyo, open_mouth, red_bra, red_shorts, sack, santa_costume, santa_hat, shorts, signature, simple_background, smile, solo, starry_background, underwear