I am trying to date a postcard. Here is a detail from it. By the ladies’ and children’s attire when would you say this picture was taken? I am guessing it was from 1910-1920 period but I am hoping someone here with a better knowledge of fashion in the early 20th century could verify. It was taken in Kingstown (later Dún Laoghaire) in Dublin, Ireland.
Given the “hussie” in center foreground - translucent skirt with a waist-length “men’s” jacket, whlie an older woman has the huge plumed hat of the 1900’s on the bridge to the left, I’m guessing about mid 1920’s.
Are those masts (sails) on the steamship?
I think the skirts are too short for that era, and too long for the 20’s (at least in the U.S., I don’t know if they had flappers in Ireland). Is it possible it could be the 30’s?
This page says Pre-1922
(Note that that the photo in the OP is cropped as compared to this one and the date is based on a sign not visible in the OP)
Kingstown changed its name in 1920 so I was assuming the postcard was from that year at the latest. Although it is possible that a postcard created later may have included the old name.
I don’t think they are masts but tbh I can’t really make them out properly.
Possible but unlikely it would have been referred to as Kingstown as its name changed in 1920 to Dún Laoghaire.
Masts, but not for sails. Probably for radio communication, flags, etc. The Titanic, for example, had similar masts.
That’s the mailboat in Kingstown Harbour circa 1900
The NLI entry says this could be as late as 1914 or 1920 even. The official records are painfully vague sometimes.
I’m wondering whether the baby stroller can be dated, along with the baby and clothing.
The baby stroller looks to be the old kind where it was just a vertical plank of timber, and they strapped the hapless baby to it with a belt across the middle. Ah, it was simpler times back then. 
I studied the photo for about five minutes (before reading any of the replies in this thread, for fear they’d give me “suggestive” answers) and then decided on 1916 as being a close answer.
I have no proof or basis or cites to back this up other than just my own guess/opinion, though.
I’m usually pretty good at guessing numbers having to do with age, though. I once worked a few Summers as a “Guess Your Age” guy in a small fair. I like to think it helps with dated photos too, but it may not.
I know ladies hats are relatively easy to identify by era. I did have a link at one stage but cannot now find it, sorry.
Perhaps as early as 1912-14 if the two young women were girls. Calf-length skirts were coming in ( although better to say the ages of shorter skirts were rising as Victorian children had worn them knee-length ) for the young.
Most of the internet will concentrate on the wealthy for fashions. I doubt if many Killarney — or Dorsetshire —housewives wore the garments in Wikipedia’s 1910s in Western fashion.
I’m going to say during WW1. That looks like a troopship and it looks like a mass of people (troops!) boarding it in the background. It was a common enough activity in Port Kingston at the time.
I think I am going to put down c1910s.
Looks like a painting to me. Not a photo.
It’s definitely a photograph; you can tell from the fact that it’s sepia toned - the original photo was probably developed using sodium sulfide (which would still have been in use around WWI).
If the masts are for “radio” (which I agree it looks like). the original ship communication was known as “Marconi” after its inventor.
It did not do voice - it just splattered Morse Code across the electro-magnetic spectrum.
So the photo was taken after the Marconi system was in wide use.
p.s. - sepia toning was still available into the 90’s (too lazy to check) and will still be around as long as black and white chemistry is produced.
I can see why you’d think that, it has a thick-lined look to it in places, especially the trees. But the composition is too awkward, and the sign frame-right would be left out, for a painting.