Just received an order of 2x wide leg jeans, 3x dresses and a blazer. I got everything in a size 24 because a) I've gained weight and gone from an 18/20 to a 22 and b) I've always found M&S items a bit short on me (I'm 5ft9)
The jeans had absolutely no hope of fastening, one of the dresses was basically a top. The other two dresses fit pretty well (but like a 22 from Next or Fat Face - one is stretchy, one is not, both quite fitted styles) as does the blazer (also fitted style).
I have linen shirts, tops and knitwear from M&S in a 20/22 and they fit great too. Bottoms are not my friend, clearly!
Does anyone else experience this?