When looking at Dior Homme, the reference code is often used to place the item within the season it was produced. Here we decipher a typical/standard code: 5EH1015678 E47 B6A8 (SS'05 blue glitter jeans).
'5' refers to the year, that is, 2005.
'EH' refers to the season, that is, Eté (Summer). HH refers to 'Hiver' (Winter).
'101' refers to the item group, in this case, trousers (Pantalon). Other examples: 102 refers to blazers (Veste), 105 to shirts (Chemise) and so forth.
The next 4 numbers '5678' should refer to the specific item, with jeans it will reveal the type of cut as the entire 16 digit reference code will only differ by the first 2 digits in this set of 4 numbers for the differing cut. As noted earlier, the # for this item is 5EH1015678 E47 B6A8, referring to the 21cm cut. The # for the 19cm variant is 5EH1011678 E47 B6A8.
'E47',is the fabric code.
The last 4, 'B6A8', is the colour code. In this particular case, 'B' refers to Bleu (blue), as in indigo blue, the main colour of the jean. 'A' refers to Argent (silver), the colour of the glitter. Another example would be B6N0 - the colour code for the SS'03 released classic blue distressed clawmark jeans painted over in matte black paint. The B6 again refers to the base colour bleu whilst the N0 refers to the black paint ('N' for Noir - black).