You're absolutely right. Being forced to dress in clothes that you're uncomfortable with in any circumstance is bullshit, be it "girls forcing their female friend to wear revealing clothes" or "class being forced to wear [insert fetish outfit here] for a school festival." I'm calling out this, specifically, in this instance, because it seems like there's a rise in forced crossdressing scenes in manga, even non-ecchi, wholesome series. Nothing wrong with crossdressing itself, and here, MC at least was willing to put it on himself for them (then last page, the more that I've thought about it, has carried a lot of weight), but in too many manga lately, there's scenes where a male character is literally dressed up by others while fighting it the entire time, like their friends just do not care.
I probably came off as too strong in my initial comment because...gosh dang, consent has been in a decline in a lot of manga I've been reading, from being assaulted in sleep while girlfriend helps other girls commit assault, to being drugged into sex while made to believe you're at fault, to any number of "I live in your house now against your will (or vice versa)" stories. Seeing yet another scene where friends force their friends to crossdress (which carries a lot of weight for some people) just kinda made me snap in that instance. Again, at least we have that last page showing he was willing to do so for them.