Many people complain about the massive difference in sizing especially when it comes to women’s fashion. You may be a size 12 in one shop but a 10 or 14 in another. This can make it very hard to buy anything without trying it on first.
Even sizing within the same shop can vary and sometimes it’s due to the style of the item but other times it is due to the manufacturer. If the clothing is manufactured in different places then they may class a size 12 differently to what another manufacturer does.
When ordering online you will often find a size guide which gives you the actual measurements used to determine the sizes. This may be a more reliable way of checking which size you need to order.
Before making a purchase online or instore it is important to check what their returns policy is. Many retailers will offer you the chance to return the item but you may not be eligible for a refund. Instead you may have to accept an exchange or a credit note.
If you cannot try the item on due to the fitting rooms being closed or they do not have any, then confirm with the shop if they would be willing for you to return the item for a refund if it doesn’t fit.