Sound advice. I too have had around 30 or so pounds find their way onto me. As a result, I have been doing things a bit differently. Which in my case means that I'm leaning more to the conservative side.
I usually don't tuck in my tie, but rather just tie it so that it is a little around an inch above the waistband. I then use a tie clip to keep things in place. But lately the two have been interchangeable.
Recently I have also developed a fondness for sweater vests. By using these, the waist belt has been made obsolete and tie length is of no consequence. That is so long as you don't have it hanging out of the bottom of the vest.
Given the current temperaturestate up this way, the sweater vest also allows me to omit the jacket at my discretion.
The biggest change I've made is occasionally wearing my double breasted shell jacket closed with no waist belt and the top buttoned back to show the tie. This is probably the most slimming outfit I have outside of some of my 13th century long tunics. It should be noted that it is also a very untraditional look more suited to those who kilt in a historically inspired contemporary fashion.
Keep your rings charged, pleats in the back, and stay geeky!
https://kiltedlantern.wixsite.com/kiltedlantern
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