I'm not sure what to say. I don't think I'm a Naljorpa--maybe this directed toward those who think they are.
I do consider myself a Lay Practitioner, though...with a household and kids (no yaks, though).
At the centers I've gone to, here in the SF Bay Area, most of us wear western clothing most of the time, with maybe a Zen (white, or maroon). But some folks have completed 3 year retreat, and they wear robes with the Zentra (striped Zen)--that's the "uniform" for 3 year retreat grads, who guess I'd call Yogis, even if they are lay. There are a few monks, too, westerners, with vows, and with the monastic robes.
During "retreats"--at home, or at centers--I will wear the lower skirt (Shamgyur, not monastic Shentab) and dharma colored shirts, usually with a white zen. Sometimes a maroon zen. I was told to do this by my Lama, in acknowledgement of the practices I've done as part of a retreat program he instituted. If it's just a visit for a puja, though, it may just be a zen, or not even that.
I've heard there is one center here in Northern CA that has most people wearing robes during retreats, regardless of their "qualifications."
I drink sometimes. No other intoxicants, no smoking, and I maintain the other lay vows as best I can. I eat meat, except during Saga Dawa when I'm veggie for a month. I also play, and listen to, music, and I even may dance on occasion! Sometimes, I take vows for a few days at a time, esp. in retreats, and Nyung Nes of course, etc.
Does that answer your question? Ultimately, I think it boils down not to what you wear....it's about a daily practice, and a lifestyle of moderation.