A simple, pretty dress in an age-appropriate style is ideal, paired with a cardigan if the dress itself is sleeveless
Plain ol' work jeans are fine for manual labor, of course just change out of them once the job's done
This dress has a lapel collar that adds a formal touch, making it suitable for both casual and semi-formal occasions
While monk straps have a historical precedent, as shown here, they have exploded in popularity in the 21st century, as their formality level is above that of styles like loafers and boat shoes, but not quite as reserved as Oxfords
Even if you don't like florals, in fact if you HATE them, this is still a safe buy