Dressmakers, Tailors, Dress designers - Looking for advice

[No Vested Interest]

I'll be Mother of the Groom in 5 weeks;
An appropriate dress is difficult to locate - size, color, style all involved.

I've finally located one I like - dress and jacket.
Problem is that it's full-length, would need to be shortened even if I were keeping it full-length, which I do not want, likely could not safely wear.
I realize the full-length is more elegant, but it's a fairly small wedding and I really couldn't carry off the full-length, nor want to, with any aplomb.
I would like it to fall just below the knee. I'm 5' 5"+, not slim.
The skirt portion, connected to the top, has several soft pleats; the fabric is a satiny polyester, according to the printed description, and a separate lining.

My question of those who know about these things is: can the skirt be shortened while maintaining the style?
IOW, will it look funny to have a dress made to be full-length shortened to knee-length?
I really like the dress best of any I've seen, but don't want to look like a home-made hair-cut.
(The shop will alter, for a price; the dress itself is rather pricey, but I'm willing to pay for this one-time, special occasion.)

Thanks in advance for any advice you can offer.

Edited to add: If exposure is limited in this forum, would I do well to repost in the lounge? Thought I'd come to the specialists first!