Spolas? "Subarmalis"?

[Tarbicus]

Would that mean I SHOULD put the opening in front since a musculata opens at the sides?

Darn you Jim! I had this all figured out!! Evil or Very Mad

let me go rethink this.

I don't think so. Nah. The only Roman garments I know of that closed at the front would be a seg, and a paenula (and variants of) kind of. I've probably missed something there, but by and large garments were pulled over the head. Stick with the norm I say, and keep it fastening at the sides.