We spent close to a year trying to decide if we wanted to do uniforms, corporate apparel, etc.
We tried shirts, a specialized company for all pieces, a set cost allowance, etc. And here's what we decided: The people we have hired to work with us are all bright, capable adults. We have put them in charge of multi million dollar assets and feel that they are more than capable of dressing themselves appropriately each day for the position they are in, as well as the weather, all while adhering to company guidelines.
It is easier for us to deal with the singular employee who may not 'get it' than to mandate a uniform across the board.
That being said, we still stuck with Uni's for our maintenance teams for a lot of reasons, but mainly easy recognition from residents and ability to maintain clean and neat clothing.
Hope this helps.