64 per cent of adults think they end up spending more when they shop with friends .
the main reasons for this were said to be ` showing off in front of friends ' and ` succumbing to peer pressure and buying things we would n't ordinary buy ' .
in fact , nearly two-thirds of americans admit they would actually prefer to shop by themselves than with pals .
but the site that conducted the study says there 's no need to hit the mall alone to avoid buyer 's remorse .