The best way to read our size guide is to just go by the UK/US/EU size and remember there are no buttons or zips on the waist so you need to be able to pull them up over your thighs and bottom which is why the waist size is larger then the actual size.
These styles are stretch twill and have elastane running through them so if you are looking for a tighter fit these are the styles to go for as will allow easier pull up over your lower half. If you want them to be more fitted then go down a size. For example -
LESS BAGGY FIT
What the HECK is stretch twill?