Question

Right now, the XML response that I get from the API contains just the size of the clothing corresponding to its ASIN. For the case of ASIN B0069NZPHA, the Size is Small. However if you were to visit its detail page url, you can see that there are 2 sizes, Small and Medium.

Is it possible get all the sizes related to a particular ASIN?

XML Response

SimpleXMLElement Object
(
    [ASIN] => B0069NZPHA
    [ParentASIN] => B0069O8WN8
    [DetailPageURL] => http://www.amazon.com/2b-Haley-Beaded-Top-TANGERINE/dp/B0069NZPHA%3FSubscriptionId%3DAKIAJG3VKWBENQUGEYZA%26tag%3Dyoozu-20%26linkCode%3Dxm2%26camp%3D2025%26creative%3D165953%26creativeASIN%3DB0069NZPHA

    ...

    [ItemAttributes] => SimpleXMLElement Object
    (
        [Binding] => Apparel
        [Brand] => 2b by bebe
        [CatalogNumberList] => SimpleXMLElement Object
            (
                [CatalogNumberListElement] => 192612
            )

        [Color] => Tangerine
        [Department] => womens
        [Feature] => Array
            (
                [0] => SKU 192612
                [1] => Style 60HZK201N240
            )

        [Label] => bebe
        [Manufacturer] => bebe
        [PackageDimensions] => SimpleXMLElement Object
            (
                [Height] => 230
                [Length] => 1120
                [Weight] => 35
                [Width] => 670
            )

        [ProductGroup] => Apparel
        [ProductTypeName] => SHIRT
        [Publisher] => bebe
        [Size] => Small
        [Studio] => bebe
        [Title] => 2b Haley Beaded Top - TANGERINE (S)
    )

Answer 1

I would check ItemLookup and especially the ResponseGroup = Variations / VariationsSummary. (Or try any other ResponseGroup, maybe some group will show all the sizes)