Thank U

Gia is such a doll, even though she's a little tomboy (she hates ponytails, getting brushed, dressing up, ect) I do have a question though (well actually 2 questions)
1. Gia is 20 weeks she's probably done with growing right? As of today she weights 3.2 pounds (she's pretty little when I compare her to other yorkies her age). The only reason I'm asking is because I'm getting married in July & the seamstress wants to begin making Gia's flower girl dress for the wedding.
2. When do their silky coats come in? Is it too soon to tell if Gia will have a silk coat or cotton coat?