It takes less than two minutes to whip your PJs off and put some clothes on. Seriously. You are giving your children a seriously bad example.
I am a teacher, and I once had a parent turn up in dressing gown and slippers - we discovered that she'd had a miscarriage, and she took it really hard. However she brought her son in rain or shine, tearstained and pyjama-ed most days... and there was NO judgement from us (though considerable amount from the other parents). But unless you are in a serious depression like this poor lady was, there is no excuse.
I work full time and have kids, and yet I manage to get it all done. Get up early and sort yourselves out. GRR.