I laugh a little bit whenever I see guys trying to buy clothes for their girlfriends for Christmas. If it's too small, she'll think you want her to lose weight. If it's too big, she'll think you think she's fat. Or it'll be unflattering. There's a reason women spend so much time in dressing rooms. It takes a long time to find clothes that look good. Unless it's a scarf or a bathrobe, please don't buy it.