where do you buy your going out tops??

i have a very modest closet… corporate work clothes… and sweats… i want to start putting more effort into my going out fits. but i’m very shy. i don’t want to wear lingerie, and i have very small breasts, so i feel like tops just won’t inherently look… sexy! on me. abercrombie doesn’t have anything that really interests me. and i avoid amazon due to quality. what other sites can you recommend??