I'm a size 12, 5ft 4, 9 stone 10.
I've been this size and weight for about 10 years. Suddenly I can't get size 12 dresses over my head/up over my waist.
Have clothes sizes shrunk? All my existing clothes fit, some of them are even a size 10.
I've bought (and sent back) about 20 dresses in the last couple of months because size 12 clothes appear to be getting smaller.
I've weighed myself and if anything I'm slightly lighter than usual, and all my normal clothes fit, it's just new dresses!