Русско-английский словарь пословиц и поговорок
ПЕРВОЕ ВПЕЧАТЛЕНИЕ ОБМАНЧИВО
At the first glimpse, you cannot get the right idea of what men or things are like
Cf:First impressions are untrustworthy (Br.). Judge not of men and things at first sight (Br.). Judge not of men or things at first sight (Am.). Never judge by first impressions (Am.)