Is it permissible for us to wear or incorporate Chinese/Japanese styles into our clothing, and is it permissible for women to wear fitted, but not tight, garments among women and mahrams?

If the specifications and conditions for the Muslim woman's attire are met in Chinese or other manufacturing, then there is no objection to wearing it. However, if the intention is to wear their specific models that are revealing or resemble the disbelieving and immoral women, then it is not permissible to wear them. There is also no harm in wearing a loose garment that does not define the body's members or cause temptation, especially if this is among women and unmarriageable kin (mahrams).