Jones to Buy Barneys in \$400 Mln Deal  NEW YORK (Reuters) - Mid-priced clothing retailer and maker  Jones Apparel Group Inc. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=JNY.N target=/stocks/quickinfo/fullquote"&gt;JNY.N&lt;/A&gt; said on Thursday it was buying  Barneys New York Inc. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=BNNY.OB target=/stocks/quickinfo/fullquote"&gt;BNNY.OB&lt;/A&gt; in a deal worth \$400 million as  a move to expand into luxury apparel retailing.