Even if I don't have a client facing role, I still don't want to see colleagues in their pjs, in a onesie, or looking like they are going clubbing. You can be as casual as you want, there's absolutely no need to wear tank tops and spaghetti straps, no bras or ridiculously tight jeans.
Good for the posters who work in an "everything goes" office, I would hate it
Def just as well not to work in certain industries in that case, where dress codes in many many companies are just not a thing.
Today at work:
CEO wearing flip flops
Loads of senior people with full limb tattoos on show
Women in strappy tops
Men and women in shorts
No one gives a shit, the only thing anyone cares about is the quality of the work and how you work with your colleagues, and the relationship you have with clients. Our clients aren't interested in how we dress, as long as we're delivering creative, innovative, effective work.
I wear skinny jeans so sounds like I would probably offend your sensibilities as well!