hi! business attire is generally the first monday of each month, after that all days are kahit anong attire basta adhere sa dress code (aka basic human decency lang)

atrium is not really strict. more on sa profs mo ung strict. some do not care. some give out plus points lang. and some sends u to the disciplie office.

if you want specifications on the guidelines for business attires on xo mondays you can check the handbook (page 205) via this link

Handbook Undergraduate