Should or shouldn't i ?

Should i or shouldn't i buy this dark sea BLue tube dress for coming CNY? Recently love this dark sea BLue color even for my nail polish color!:)
so many question marks inside my "Brain"~
if bought, then where to wear? what kind of events? worth it?(since i going to continued my study~)
if not buy, will i regret? haha!

drop some opinion here plz~ASAP! :)
**the black color line was painted purposely~