The size on the label is 38-40 which is UK size 10-12. The material for both items is stretchy.  The leggings have an elasticated waist.  The waist is 26 inches / 66 cms.  The inside leg is 32 inches / 81 cms.  The bottoms of the leggings have a rib. The top is black with a white pattern down the sides of the top and the bottom of the sleeves.  It has a round neck and long sleeves. There is a ribbed cuff at the end of the sleeves.
The pit-to-pit measurement taken from the back of the item is 18 inches / 46 cms.
The length of the item taken from the back of the neck to the bottom hem is 23 inches / 59 cms.
The length of the sleeve taken from the armpit to the end of the sleeve is 21 inches / 53 cms.
Please check the measurements. 
If you have any more questions please ask. 
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Thanks for looking.