I would say.... just be yourself. If they like it, well and good, if they don't, that's ok too; as you never know who you are being a witness to. But certainly never change "how worldly" you are to please those whom you are in company with at the time. God sees you at all times and has called you for his purposes (Eph 2:10).
" For do I now persuade men, or God? Or do I seek to please men? For if I still pleased men, I would not be a bondservant of Christ." Gal. 1:10
God bless you