Nellie, the Cotton Traders, Debenhams and Dash all come in different lengths, in fact the CT have 27, 29, 32 and 33inch. T 5'3" I am usually somewhere between short and regular so buy R and wait until they have been washed before adjusting the length if necessary.
I am disappointed that my current shabby M&S joggers are no longer available because they were good quality with zipped pockets and looked like proper trousers. None in my size even on Ebay old stock site. I am sure you don't look a dork Jalima, and joggers would be comfy for a flight.