Subglandular Breast Implants for a thin woman will not cause any aesthetic issues. Is this true?

In the short term you may have excellent results as a thin woman with implants above the muscle, especially if the implant is not too large.  Long term is a different issue.  In my experience, subglandular implants are less likely to maintain a great cosmetic look long term, and are more likely to lead to rippling and contracture.  In my practice, more than 99% of implants are placed below the pectoral muscle.I know it must be difficult to hear different opinions.  Best of luck!

In general, patients as thin as you generally fare better with submuscular augmentation in addition to enjoying the other benefits of SM augmentation (lower incidence of capsular contracture, no superior or medial rippling).   It seems like you are planning to use a modest implant and sounds like you have selected an experienced surgeon so you should do well. 

This is a great question and I think your surgeon's experience is critical, but in general I personally prefer the submuscular pocket as it seems to work well for most patients.  But there are instances where a subglandular pocket can be appropriate and quite reasonable, in particular when using silicone implants or even the form stable highly cohesive gel breast implant.  It may be helpful to chat with your surgeon and discuss which type of implant he would plan on using.