Family of 3 - DH and I need professional attire, DD mad into lots of sports and also messy, could do better on sheets but do wash towels frequently.
Usually approx. 4 per midweek (set up every night to wash while we're out next day, it's ready when we all get in at teatime). Mostly darks or colours, 1 whites per week.
Weekends usually another 1-4, for towels, sheets (generally about every 2-3 weeks, I know, shocks), and if we have had an extra heavy week of clothes usage (delicates load needed occasionally, bad weather meaning getting through more, coats needing cleaning reasonably frequently, gym gear or sailing gear needing a wash every 2/3 wears but not weekly, or the mud that happens at scouting events!!).
So realistically, I do about 6-10 per week. But I also have enough in wardrobes that if I fall behind, there are plenty of clean clothes to see us through. And I tend to prefer to wash lots and have things clean and dry but not necessarily folded or ironed (that's a big, once a week, job) so we can get something out that's clean but maybe slightly rumpled if needed (extra school match, "my favourite" hoodie needed, "I'd prefer the navy trousers for this week's overseas trip even though I already wore them this week", a rare wet/sick bed needing changing and clean PJs in middle of the night etc).
I have now got DD putting her dirty clothes into a basket in her room at night, and she will re-wear tracksuit bottoms and hoodies that are still clean (not loads of wears - but I am happy to get a 2nd wear out of those). We all change the layer beside our skin on a daily basis, and after work/school if necessary as well.