Dillema: Younger Looking MOB Dresses - Online?

My mom's hot...she's 45 y/o, and I'm her eldest (25 y/o) and I have two younger brothers...one that's 19, and then our 'baby' who's 10...so my mom's pretty young, and the MOB dresses we've seen are very (no offense to anyone) old lady looking...or very young looking...

Does anyone know where we can look (she'll probably have her dress made by my dress maker) online for younger looking MOB dresses?

Thanks Girls!