What is the ruling on a woman whose husband has died wearing new clothes?

A woman whose husband has died observes an 'iddah (waiting period) of four months and ten days. During this time, she must avoid wearing clothes considered adornment. However, there is no harm in her wearing new clothes if they are not inherently decorative. The fundamental principle is that anything manufactured is permissible as long as it is not intended for adornment, with the exception of dyes and perfumes.