Your customer is no doubt asking for all the dross on this poor sign.
From the description of the sign's location it needs to be kept uber simple. Nobody driving by will have time to read all that.
Most people would figure out that they do sewing and embroidery if you put "sewing and embroidery" on the sign. No need to have it on there twice.
I'd make it bold and simple so it could be read from down the block.
Bingo.
Up to your post signmeup I couldn't understand why people were trying to put the copy on twice.
.
ROWE
Sewing
And
Embroidery
Professional
Alterations
Of the above words, which one(s) are not needed?
If they don’t make complete dresses or suits, then Sewing is not needed.
Alteration should be used only. Besides, you already have a graphic of a sewing machine.
ROWES
PROFESSIONAL
ALTERATIONS
AND
EMBROIDERY
You could also drop the "AND".
Just my thought on the copy.