The objectives of this survey research were to study the 1) lifestyles, 2) self concept, and 3) fashion innovativeness of teenagers in Bangkok. Questionnaires were used as a method to collect data from 400 senior high school students, age 15-19 years old. The results were: 1) The lifestyles of teenagers in Bangkok were divided into 10 groups; 1) Fashion oriented group, 2) Future and achievement oriented group, 3) Social conscious group, 4) Conservative group, 5) Self-convenience loving group, 6) Struggling group, 7) Entertainment loving group, 8) Religious devoted group 9) Prudent and game loving group, and 10) Family oriented group. 2) The actual self concept and social self concept displayed by teenagers were congruent in every attributes. 3) The percentage of fashion innovators by teenagers in Bangkok was 11.4%, while the percentage of fashion followers 88.6. 4) Teenagers' lifestyles were significantly and both positively and negatively related with the self concept. 5) The lifestyle of Fashion orientedgroup was significantly and positively related with fashion innovativeness, while those of Self-convenience loving group, Conservative group, Struggling group and Prudent and game loving group were significantly and negatively related with fashion innovativeness. 6) Teenagers' self concept was significantly and both positively and negatively related with their fashion innovativeness.