uniform questioning

i got the job! i start today at 3pm est, just wondering do i NEED to have a certain pair of pants? i know that i need to have non slip shoes (which i dont have unfortunately, gonna work in my jordans for now) and probably black slacks, just wondering if anywhere is more lenient. when i worked at sonic i had to wear black jeans or slacks so i figure its probably the same thing but curious as if anyone doesnt have to wear that.