Members of Scottish clans show their allegiance to their clan and chief where crest badges. These are usually worn on a bonnet. Crest badges are usually made up of the chief's heraldic crest surrounded by a strap and buckle with the chief's heraldic motto or slogan. The crest badge used by members of Clan Maclachlan contains the Latin motto FORTIS ET FIDUS, which translates to "strong and faithful". The blazon of the crest within the badge is (Issuant from a crest coronet of four (three visible) strawberry leaves Or) a castle set upon a rock all Proper. Another clan symbol used to show a clan member's affiliation is a clan badge or plant badge. Consisting of a particular plant, these badges are sometimes said to be the original means of identification used by Scottish clans. Clan Maclachlan has two clan badges attributed to it. These include: rowan (or mountain ash) and lesser periwinkle.

Many clans are also attributed pipe tunes. Clan Maclachlan's pipe music is Moladh Mairi (translation from Gaelic: "In Praise of Mary").