I would start by changing all those SELECT TOP 1. You're reading the tables multiple times when you can read them just once.

Your WHERE clause is not SARGable so you're reading the whole table (or index) to look for the appropriate values.

This is an example based on your query:

SELECT min(WCI_ITNO) AS 'NASKU'
    ,wi.WIImageURL AS 'IMAGE'
    ,wi.WILargeImageURL AS 'WILargeImageURL'
    ,min(WCI_DESC) AS 'ITEM_DESC'
    ,min(WCI_IUM) AS 'UNIT'
    ,min(WCI_XFNO) AS 'ITEM_NUMBER'
    ,min(WCI_ITYP) AS 'WCI_ITYP'
    ,wi.WIPDFImageURL AS 'WIPDFImageURL'
    ,min(WCI_DSC2) AS 'CASE'
    ,min(WCIBrand) AS 'BRAND'
FROM WWW_CatalogItem
INNER JOIN IG2011 ON IGITNO = WCI_ITNO
        AND IGCTYP = WCIType
        AND IGCODE = WCICatalog
LEFT JOIN [WWW_CatalogRetail] ON WCRType = WCIType
            AND [WCRCatalog] = WCICatalog
            AND [WCRCode] = WCIRetail
            AND WCIRetail <> 'ZZZ'
/*LEFT JOIN [WebImage] ON wiitno = wci_itno*/--Apparently this is not used.
LEFT JOIN [NA ASI]..t_products Promo ON WciProdId = Promo.ProdId
INNER JOIN TS2011 ON IGCTID = TSCTID
        AND TSCTYP = IGCTYP
        AND TSCODE = IGCODE
        AND TSCNT != 0
LEFT JOIN ItemInformation ON IIITNO = WCI_ITNO
           AND IIRID = 'CAT'
           AND IITDSC <> ''
           AND IITDSC IS NOT NULL
OUTER APPLY(SELECT TOP 1 WIImageURL, WILargeImageURL, WIPDFImageURL
        FROM [WebImage]
        WHERE wiitno = wci_itno
        ORDER BY wiseq) wi