Sizing help.

  1. Is a size 26 a size 2?
    My Lucky Jeans say 26 then under it 2
    But a girl at my work said that they size things funny..and once at a store the lady told me to add whatever size you are to 21. Example: you're a size 5. 21 + 5= 26
    So am I a size 5 then? or 2?

    Sorry if this is confusing. I need closure lol