The equivalent would be a size Men's clothing, especially designer clothing , is often sized differently in other countries than in the US. You can easily do this online at several websites. Finally, you will need to measure your inseam. There is a correct way to do this based on the area of your body you are measuring.
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Please note that size charts relate to ASOS own brand clothing and are designed to fit to the following body measurements. Some brands may vary from these measurements but you can still use them as a . Size Bust (cm) Waist (cm) Hips (cm) 4 XXS 76 59 84; 6 XXS 80 63 88; 8 XS 84 67 92; 10 S 88 71 96; 12 M 93 76 ; 14 L 98 81 ; 16 L 86 ; 18 XL 92 ; 20 XL 98 ; Average in seam leg lengths for full length pant: Short 74cm, Regular 78cm, Long 82cm. Only selected styles are available in extended size range. Of course, I (foolishly) just bought what I thought was the correct size, without realising that the sizes in the USA are different to those we use here in Australia. I take a 3XL shirt size here in Australia, which means about a 46 inch chest size.