what size of vitoria's secret panties should i wear?

X small and that may even be too big for you. You are tiny. I fit into a small at VS and I wear a size 7 at abercrombie (because there pants run super small)

x-small, they run a litlle big

x-small. not convinced? look at their sizing charts.

xsmall

xsmall.

I would say small, you don't want panties to be too tight on you.