Please do not bracket when buying clothes on eBay.  Most eBay sellers are not large corporations, they are individuals who count on their sales to pay bills.  Bracket buying greatly affects the livelihood of eBay sellers, as items are often returned up to two months later and out of season by the time they make it back, causing a loss to the seller who could have sold the item to someone who would not have returned it in the time it takes to receive the returned item.  There are manufacturer specific size charts in the photos.  Taking measurements will save you the time of going to the post office and the cost of shipping for items you would return by bracketing.