I tried to buy a tank bag last year from an outfit in the UK, but it never got here and they had to refund my money.
Personal gear like helmets, boots, gloves an jackets and suits should be fitted before purchase unless you are purchasing replacement gear for something crash-damaged and you know the exact size you need.
I was in Kansas City last fall on business and stopped by Motorcycle Closeouts. First impression was that they are like Cycle Gear but a little higher-end and have a larger selection. I actually found a pair of AXO waterproof touring boots that fit me for $70. Most motorcycle-specific boots (other than engineer boots or clodhoppers) don''t fit my wide feet, so I was looking to replace the 8-year-old SIDI Mega Way rain boots with another pair of the same. The AXOs fit great, but are not advertised as 'wide width, so it was a stroke of luck I found them.
Try before you buy!
It may be a pig, but it's a pig with a rocket in it's ass!