I am a big lass, as with LuckyCuz drifting between 16 and 20 for most of the time. I was between a 12-14 once, but Jesus, was I miserable. I'm much happier now.
I managed to get to a size 10 once, but due to my hight and frame, I looked liked skelatore and I was constantly catching colds etc...plus I had equal difficulty with clothes fitting, just diffent problems.
When I was dieting back in my 20s (20 years ago - yikes I'm old!

), I managed to just about squeeze into what was then a US size 14/16 - I'm thinking it was probably a little smaller than what is considered a US Women's 16 now, and got my weight to just under 12 stone. I did that by starving myself on about 500 calories a day or fewer, and it was torture!

For US shopping, I never did much high end shopping cos I was always poor! For plus sizes, I could find things at, of course, shops such as Lane Bryant, 16 Plus, The Avenue, and Catherine's...plus mall/department stores such as JC Penney and Dillards, as well as Wal-Mart, Target, and there's a chain store called Goodys I sometimes visit as well. Most of the time when I go back to the US now, I head for JC Penney just to get staples such as my work trousers, etc (I'm not fussy - plain black is fine!) because I seem to have difficulty finding trousers that look and fit the way that I like on me, over here. Oh and I buy jeans that last forever from Wal-Mart - I usually only have a couple of pair & they really do last forever.
Thank you for all the input! I'm a guy so I didn't quite clue in with all the clothing size references but I think I understand the situation rather clearly. UK & US are similar. If you go to places in either country where skinny, fashion-centric people live, then you will feel heavier than normal and clothing sizes may not be available.
If you're a guy, I really wouldn't worry about it. Just as in the US, the whole cultural weight thing is (I think) far more forgiving for men than it is for women. You'll be just fine & I'm sure you'll find clothes to fit!
