I am a Australian size 14. I brought by my waist size of 42 inch/106 cm and got a 2XL. They fit perfectly. They are not see through. The fabric is light and soft and feels lovely to wear. Has a lot of stretch. The high waist covers my fat tummy nicely and feels comfortable, not tight. They do not roll down. The 2 pockets on the sides fit my Samsung Galaxy 20 phone easily. Postage was very fast for Australia. Package well with excellent email updates from dispatch to arrival. I will be buying again.