When ever we discuss subjects like this, IMHO, we often base our "OPINIONS" on our personal concepts of "what is proper attire". There are a number of "bias' ( in the positive sense) that come into play. Here just a few:
1. Our "cultural" background.
2. Our "Social" environment.
3. Our reasons for wearing the Kilt.
4. The "public Image" we wish to present.
5. ETC, ETC.
A CAVEAT - IMHO, Because of the above, we MUST ALWAYS Honestly examine our "bias'" & offer our opinions, with RESPECT, acknowledging the fact that others may be operating from a TOTALLY different set, which in their concepts are VALID.
It is with the above in mind, I humbly offer my " Personal opinions".
1. My "Cultural" Background = 1/4 German, the rest "primarily" UK ( English, Lowland Scots, Scots/Swede, Welsh/Irish, Welsh/Scots + since my "family" started coming to the "colonies" in 1622, I some other unknown "blood" mixed in other

BUT although my family were ALL Immigrants, they BECAME AMERICANS in the "fullest" sense. ( they did not demean their "Old Country" Heritage, but it was of secondary importance). Although I DO NOT deny or in any way "discount" my "old Country" Heritage, I do not "flaunt" it. I am an AMERICAN.
2. My "Social Environment" = I live & interact, in a very DIVERSE Ethnic Neighborhood.( low to mid income) I do Historical research & presentations ( I am part of an "academic" research team) I also INTERACT. with & train LEOs & civilians as an NRA TC & CRSO, Sit on a Board of Directors, represent entities before State & county officials,etc.) MOST of ALL, I enjoy life & the people I have the PLEASURE of knowing.
3. WHY I WEAR THE KILT = I have chosen to wear a kilt, instead of PANTS as my DAILY ATTIRE. PLAIN & SIMPLE. When I wear my Kilted Attire, it is worn, NOT as "ETHNIC Dress" ( Highland Tradition) but basically as an "alternative Style of attire", which I LIKE.
DOES this mean that I disregard the fact that the KILT is symbolic of Highland Scots Cultural Heritage & PRIDE,
NO!! I am VERY cognitive of this & I attempt to wear it with RESPECT. BUT AGAIN, when I wear the KILT, it is NOT worn to say "hey I am a SCOT, but to say I am KILTED. The MOST common ? I am asked is "are you Scottish ??" My reply is , "I have a lot of SCOTS in me, but I am an AMERICAN, who likes wearing the KILT." ( note, very often this ? is asked by individuals of Scots Heritage & I have NEVER had a NEGATIVE reaction from my reply. Quite the contrary. ( in fact, about 3 weeks ago, I was asked this by a Scots Gentleman, who was visiting the USA with his wife, & was involved with the British Council here in Seattle.We spent a couple of hours over lunch, in very enjoyable conversation & parted as "fast" friends )
3. Public Image = Taking the above into consideration, when I decided to exchange my pants for the KILT, Doing this for my "casual attire", was easy. ( I just wore the shirts, sweaters jackets, I would have worn with my "dockers, Jeans, etc.) The "Problem" came when I had to go into my " BUSINESS MODE" How do I still dress appropriately in this environment ???
MY MAJOR CONCERN, was that I DID NOT want my wearing a KILT, to detract from the "business I had to attend to & would be ACCEPTED by my PEERS as "Proper Attire"
MY choice, was to "simply" wear the "same upper attire as I would wear with PANTS ( adapted of course to fit the Kilt) If the occasion called for a "sports" Jacket, or "blazer" ( with or with tie, vest etc) then my kilt Jacket ( etc )would reflect the same "basic" style. If the occasion called for a 3 pc suit, Then ..
NOW THEN, having addressed my "BIAS', I will now present my "personal" view point on the ?? of "Day wear Jackets.
1. A Sports Jacket & "Blazers" in "civilian attire" are "casual" As MATT pointed out, the MATERIAL ( incl. color ) is perhaps the most important factor.
A. Sports Jackets often are wool Tweeds, corduroys etc. ( or quality blends)
B. Blazers are usually Worsted wool ( or quality blends)
C. Color for the above can & does include Browns, Greens, Brighter Blues etc.
D. The above is often worn with "casual ties & non matching vests.
IMHO This were the General genre referred to as "ARGYLL" fits. Glen's #1 & Matt's #1 Sports), #2 & 3 (Blazer)
2. 3 pc suit = Glen's #2 & #3 ( with matching vest) & Matt's # 2, #4, # 5 ( if worn with a matching vest )
A NOTE on ACCESSORIES = IMHO If I wear the 3 pc "look" then my ccesories are "subdued"
Here are my examples of #1 a "sports Jacket look, #2 a Blazer "look & #3 a 3 pc "look"
Thank you for your "patience & I hope that my "presentation" is accepted in the context it is MEANT, RESPECT for other views & offered to expand the envelope.. WEAR THE KILT WITH PRIDE & RESPECT
Puffer