Christmas jumpers
... that Christmas jumpers have become popular in the UK during the 2010s?
... that <b id="mwAqA"><a class="mw-redirect" href="./Christmas_sweater" id="mwAqE" rel="mw:WikiLink" title="Christmas sweater">Christmas jumpers</a></b> <i id="mwAqI">(example pictured)</i> have become popular in the UK during the 2010s?