5'4.5", 31.5 - 22.5 - 32.5
jeans/bottoms:
blue notch 25" a little big
joe's jeans 24" too big
j. crew 00 too big
zara XS too big
topshop petite 24" 28 inseam too short, 25" too big
seven for all mankind 24"
kova & t 25"
j brand 24"
juicy couture 24"
h&m 2 usually too big
free people xs usually too big
smallest size at abercrombie way too big
sophomore xs too big
uo xs too big
blank nyc 25"..fit funny though
cheap monday 24"
bdg smallest size way too big
tops/jackets
bcbg xxs fits perfectly. actually my bcbg xxs blazer is probably the only item of clothing i own that fits me 100% right without any alterations

aqua xs too big
express 0 too big
topshop 2 or petite 0
j crew & zara both too big, free people usually too big
i like tops big so i usually buy a small or even a medium (err 2-4 or 6), xs is a "true fit" tho in most stores. for jackets/coats/blazers i usually am xxs/xs or 0/00
apc xs
steven alan xs big
dresses
apc xs sometimes too big
mbmj xs too big
free people 0 sometimes too big
topshop 2 or petite 0
pencey 0
h&m whatever the smallest size is..sometimes too big depending on the cut
i usually just buy the smallest size available and it usually fits pretty ok. if it's a more form-fitting dress i'll buy the next smallest size available coz i don't like skintight clothes, which sometimes ends up working and sometimes it totally doesn't

urban outfitters xs too big
stella mccartney 36 big
see by chloe 38 too big
french connection 0 sometimes too big
and in shoes i'm usually a 6.5 or 7. if they're flats or something i don't wear socks with i'll buy a 6.5