Types of sporran

[OftKilted]

In looking at the examples mentioned in the Scottish Tartan Authority page pointed to by Artificer I noticed something interesting:

Both the Animal Mask Sporrans & the Historically Inspired Fergusson Britt Sporrans listed as being 'All Occasion.'

Having been told that an "Animal Mask Sporran is out of the question" due to a substantial dislike of them by my better half (otherwise known as 'She who must be obeyed'). (Apparently this is not something completely uncommon as Artificer and ShawnMaxwell have experienced this issue themselves ... (see X-Marks Thread Here.))

I'm curious what makes a particular sporran 'All Occasion' v.s. Daywear/Semi-Dress/Dress. Any insight would be appreciated ...