Hopefully this doesn’t sound shallow but if you workout w/mirrors, there’s NO DOUBT your outfit can affect your workout, right?! When you like the way you look (& there’s no doubt certain clothes are more flattering than others.. doesn’t have to be expensive!), you have more positive thoughts & more positive self-talk, u perform better! Whether it be some new shoes or a couple new T-shirts.. Do that for yourself if you can! I usually teach a terrible class if my outfit is unflattering {#permissiontoshop} If you only workout in ur home gym and with no mirrors, maybe this is irrelevant to u but i DO recommend mirrors for form check.