One's appearance or grooming (clothing, hairstyle, and general neatness).
面接では身だしなみを整えてから行きましょう。
Make sure your appearance is tidy before going to an interview.
彼はいつも身だしなみがきちんとしているので印象がいい。
He always looks well-groomed, so he makes a good impression.
会社の規則で身だしなみに関する細かい規定がある。
There are detailed rules about grooming in the company's regulations.
Figuratively, basic required skills, knowledge, or manners (for example, business etiquette) considered part of one's 'grooming' or professional presentation.
名刺の渡し方も社会人の身だしなみの一つだ。
How you exchange business cards is also part of professional grooming.
敬語の使い方は、若手社員にとって必要な身だしなみだと教えられた。
He was taught that using polite language is part of the grooming expected of young employees.