The problem is that Superdry sizes appear to be different from other brands in the market (I've said it in reverse commas for a reason). It and the internet are plagued by misleading information about this subject. I have decided to sort this out once and for all. Or at least until Superdry changes things up again. Superdry is actually very precise size. I know you did not expect to hear it so I'll explain why.
The Problem with Standards
There is an international standard for clothing sizes. International standardization organization, also known as ISO. They are the governing body for all kinds of standards, including a standard measure for clothes gluing. This should in theory give us a reference to being able to precisely choose clothes and convert between US, UK, European and other sizes. But it does not. There are problems with international standards.
To get too deep in these standards is beyond the scope of this article so I'll cut my hunt. There are problems in two parts; Using letter codes like small, medium, large and extra large and clothing manufacturers take freedoms with the established standards. They are not required to comply with the standard, so there will probably not be any change in the future. Compared to other clothing brands, a good rule of thumb is that Superdry clothes are about one size smaller. They are sized to fit properly, but as most other clothing manufacturers become more generous with their size, it is better to go for one size larger in Superdry clothes. For example, if you are usually a medium then you buy a big one in Superdry.
Superdry Size Chart
Superdry clothing meets international standards. The problem is that other clothing companies do not. Superdry also uses letter codes, so there must be a lookup table to convert a size from small to breast size or women's clothing size. If you have looked at their website you should have noticed that there is no such useful table anywhere to find.
Men's Superdry Clothing Expansion Chart
Sizes are breast sizes, measured in inches.
Extra Small = 36 "
Small = 38 "
Medium = 40 "
Large = 42 "
Extra Large = 44 "
Extra Extra Large = 46 "
Men's waist sizes are quite straight forward. They are all in inches, the standard measure so you should have no trouble choosing your size.
Women's Superdry Size Chart
The size in the UK and the US is adapted to ISO standards and may not necessarily match the size you would normally buy in other clothing brands.
Extra Small = UK Size 8 / US Size 4 = Bust 34 ", Mid 25.5", Height 36.5 "
Small = UK Size 10 / US Size 6 = Bust 34 ", Mid 26.5", Height 37.5 "
Medium = UK Size 12 / US Size 8 = Bust 35 ", Waist 27.5", Height 38.5 "
Large = Size 14 / US Size 10 = Bust 36 ", Mid 28.5", Height 39.5 "
Buy Superdry Clothing
Probably the best advice I can give you try before you buy but what if you do not have a store near you? If this is the case, you're left with the only option to shop online where you can not try the item before you buy it. However, there are exceptions. Some stores, like Nucleus, offer a free return item on the internet order so you can try it out and return it if it fits. It's a small problem to get to the post office, but at least it does not cost anything.