At 5'8 140 whatmightmy size be?

i just want to get a general idea.

I know body frames differ, but if it help im bettween a medium and large(closer to medium)

what are your sizes?

I am 139 and just under your height and i am size 6. I am also a medium build :)

i'm 5'8" (small frame) and currently 143, size 8.  my 8s get baggy around 139-140. 

I'm 5'8'' and weigh 134.  I wear a size 7 juniors and a size 6 misses.  I would guess that you are a size 8 or 9.

yepp , i am a size 9/10 and those are baggy i'm currently 156.

5'8" 145ish size 6, sometimes a 4, 28 jeans.

I am 5'8. When I was anywhere from 135-145 I was a size 9 mostly which is roughly a 30 inch waist. In some brands I was a 7. Now, at 180 lbs, I wear a size 16. When I was 160, I wore a size 13. 

5'8", 150-155 -- I wear a 6/7 in jeans, and a medium top.  I don't really wear skirts/dresses, but the few I've tried on lately varied btwn 6-10 (I have really broad shoulders.  I have a fair amount of muscle on my med/large frame

I was probably an 11 at that weight, and I only got down to a 7 at 120, but I have a small frame, so you'll probably wear a smaller size at the same weight. 

im 5'8 and 131. ive a small to medium frame. i dont understand american sizes, but id be a uk size 10 (27-28 inch waist)

5'7" 135 i was a size 5. so at your height, 140, i'd imagine a 5 or a 7.

i am the same as caitling - i'm 5'8" and at 145, I wear a size 10/11 or a size 31... I'm a small frame, according to this site, and a pear shape (that could change what size you wear as well as height, weight, frame, etc.)