Dress Considerations for Altar Servers
All that we say and do when we serve as an Altar Server at Mass speaks about our reverence for the sacred action that takes place during the liturgy. That includes our demeanor and how we dress. The focus at the liturgy is the Eucharist. Anything that detracts or calls attention to oneself and away from that central point, including one’s dress, should be avoided.
For Altar Servers, consideration should be given to any portion of their dress that may be visible to the congregation. Given that a person's height may not match the length of their Alb, dress shoes for men and closed toed shoes for women are appropriate and preferred.
Tennis shoes and flip-flops are considered inappropriate.
"If you question if your shoes are or are not appropriate, they probably are not; please err on the side of caution"